The atomic number of an element is 11. What is the likely arrangement of the valence and core electrons in a neutral atom of this element?
Answer:
The correct answer is 10 core electrons and one valence electron.
Explanation:
The electrons in an atom, which are not valence and do not take part in chemical bonding are known as core electrons. The core electrons and the nucleus of an atom produces the atomic core. These core electrons are held tightly with the nucleus. On the other hand, the outer shell electrons, which are associated with an atom and take part in the generation of a chemical bond is the outer shell is open are known as valence electrons.
In the given question, the atomic number of an element is 11, thus, the electronic configuration will be,
1S² 2S² 2P⁶ 3S¹
Hence, there is only one valence electron and 10 core electrons.
Li+ is an ion that has lost 1 electron in order to have a full valence shell, making Li+ a cation. What charge does the element Be (beryllium) hold? Predict what elements will bond with Be in order for it to reach stability.
Answer:
See the answer below
Explanation:
Beryllium forms an ion with 2 electrons in its outermost shell. Hence the charge on the element is 2+, that is, Be2+. In order for Be to form a stable bond with another element, such an element must have a deficit of electrons in its outermost shell. Beryllium will have to donate its 2 electrons to this element for its self-stability.
As Mia mixed two substances in a test tube, she noticed that the test tube became warm. She also noticed gas coming from the test tube. Based on Mia's observations, what was most likely occurring inside the test tube?
The two substances underwent a physical change
The two substances were melting
A new substance was forming
A change in the mass of the two substances
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Answer:
A new substance was forming
Explanation:
Two types of changes are undergone by substances involved in a reaction. They are physical changes and chemical changes. Physical changes are those changes that does not involve the synthesis of a new product. On the other hand, CHEMICAL CHANGES alters the chemical composition of the substances involved, and hence, new substances are formed.
Chemical changes are usually characterized by change of temperature, color change, evolution of a gas etc. According to this question, Mia mixed two substances in a test tube and noticed that the test tube became warm. She also noticed gas coming from the test tube. Based on Mia's observations, a CHEMICAL CHANGE, LEADING TO THE FORMATION OF NEW SUBSTANCE, HAS OCCURRED.
a night when the temperature is 22°C
Answer:
what is the question? :)
What is the definition of epinephrine?
a stress hormone
a secretion of the synapses
a signal in the frontal lobe
a sex hormone
Answer:
a stress hormone is epinephrine
35 POINTS!!!!
Four forces are exerted on an object as shown below: A square is shown with an arrow pointing up labeled 3 N, an arrow pointing right labeled 2 N, an arrow pointing down labeled 4 N and an arrow pointing left labeled 2 N In which direction will the object move? Up Down Left Right
Answer: Down
Explanation: There is more force pulling on the object
What makes up an ionic compound?
A. A positive anion and a negative cation
B. A positive cation and a positive anion
C. A negative anion and a negative anion n
D. A positive cation and a negative anion
Pick all that apply
Answer: B
Explanation: Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. (A cation is a positively charged ion; an anion is a negatively charged ion.)
Bullets have only class characteristics, not individual characteristics.
A. True
B. False
Answer:
B false
Explanation:
Easy points
Please help quickly
Part 2: Determining Similarities
Using only the groups of the periodic table, choose one element that is chemically similar to each of the
following elements
Carbon
Cesium
Krypton
Magnesium
Aluminum
Bromine
Answer:
Magnesium, strontium, and barium belong to group 2A of the periodic table.
There are______sulfur atoms and________hydrogen atoms in 100 molecules of C4H4S2.
Round to the one's place.
Answer:
200 sulphur atoms
400 H atoms
Why is human waste hazardous when it enters the water system? for London and Ancient Rome?
I will mark as brainliest
In support of the Thirteenth Amendment, President Lincoln argued that
slavery did not impact the Civil War.
slavery should be made illegal everywhere.
slavery should be allowed in the South only.
slavery should be allowed in the North only.
Answer:
should be made illeagl everywhere
Explanation:
i took the test
Abraham Lincoln believed that American democracy meant equal rights and equality of opportunity. According to him, slavery is wrong both morally and politically. He said that slavery should be made illegal everywhere. The correct option is B.
What is Thirteenth Amendment?The 13th Amendment to the U.S constitution ratified in 1865 in the aftermath of the civil war, abolished slavery in the united states. The 13th Amendment states that ''Neither slavery nor involuntary servitude, except as a punishment for crime shall exist within the united states.
The term slavery indicates the ownership of a person as property, especially in regards to their labor. A slave is a person who is owned by another person or is forced to work against their own will.
Lincoln's position on slavery in the united states is one of the most discussed aspects of his life. Lincoln frequently expressed his moral opposition to slavery in public and private.
Thus the correct option is B.
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Is water wet? A. yes B.no C.Idk
Answer:
C
Explanation:
when in doubt pick C...
PbS+FeN → Fe2S3 + Pb3N2
Can someone please valence this for meeeee
Answer:
html
Explanation:
im in web tech
Convert 9.3 moles of KBr to grams.
Answer:
119.0023 grams
Explanation:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles KBr, or 119.0023 grams.
The mass of one mole of KBr is 118 grams. Hence, the mass of 9.3 moles of KBr is 1097.4 grams.
What is potassium bromide?Potassium bromide is an ionic compound formed from combination of potassium and bromine atom involving the loss of electron from the potassium metal to the bromine atom.
The atomic mass of potassium (K) = 39 g/mol
atomic mass of Br = 79 g/mol
Hence, the molar mass of KBr = 79 + 39 = 118 g/mol
Therefore , the mass of one mole of KBr is 118.
The mass in grams of 9.3 moles of potassium bromide is thus, 9.3 times the mass of one mole of KBr. Thus,
mass of 9.3 moles = 9.3 × 118 = 1097.4 g.
Therefore, the mass in grams of 9.3 moles of KBr is 1097.4 g.
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The first step in the scientific method usually is:
A:formulate a conclusion
B:conduct an experiment
C: develop a hypothesis
D: ask a question
Answer:
ask a question
Explanation:
You have to ask a question or solve a problem before you can develop a prediction/hypothesis, conduct an experiment or even make a conclusion. The question comes first.
What does each row (across) have in common?
Which of the following electrolytes would you use to electroplate silver (Ag)
on iron (Fe)?
A. CuCl2
B. FeSO4
C. Zn(CIO3)2
D. AgNO3
Answer:
D. AgNO3
Explanation:
a-p-e-x
The correct answer is D or AgNO3.
In which layer of Earth's atmosphere does outer space begin..?
A. ) Stratosphere
B. ) Mesosphere
C. ) Thermosphere
D. ) Troposphere
Please post a real answer.
Answer:
Option C
Explanation:
Because of how low the air density is, most consider it as entering outer space when you enter into the "Thermosphere" or option C. The Thermosphere is approximately 800 kilometres in the sky right above the Mesosphere and the Stratosphere which most fighter jets maximum height is.
Hope this helps.
What is the relationship between a chemical equation and a chemical reaction? What are reactants and products in a chemical equation?
Answer:
A chemical reaction occurs when reactants are converted into products. A chemical equation is a representation of a chemical reaction using chemical symbols. The chemical equation also indicates the physical state of the reactants and products. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
Explanation: because UwU
A chemical equation is an expression that gives the identities and quantities of a chemical reaction. A chemical equation shows the reactants on the left side and the products on the right which are separated by an arrow.
What is the chemical equation?A chemical equation is the representation of a chemical reaction in terms of symbols of the substances. A chemical equation consists of reactants participating in the reaction, formed products, and an arrow showing the direction of the chemical reaction.
The equation in which the number of atoms of substances is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass follows by a balancing of a chemical equation. According to this law, in a chemical reaction, the mass can neither be created nor destroyed.
By obeying this law, the total mass of the elements present on the reactant side should be equal to the total mass of elements present on the product side in a balanced chemical equation.
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Diploid cells have:
a. the regular number of chromosomes of the parent organism
b. twice the number of chromosomes of the parent organism
c. half the chromosomes of the parent organism
Answer:
c
Explanation:
355 g of chlorine gas (MW = 70.9 g/mol) isheld in a vessel with a fixed volume of 70.0 L. What is the pressure of the gas in atmospheres if it's temperature is 30.0 degrees celcius?
Answer:
1.78 atm
Explanation:
From the question given above, the following data were obtained:
Mass of Cl = 355 g
Molecular weight of Cl = 70.9 g/mol
Volume (V) = 70.0 L
Temperature (T) = 30 °C
Pressure (P) =?
Next, we shall determine the number of mole in 355 g of chlorine (Cl). This can be obtained as follow:
Mass of Cl = 355 g
Molecular weight of Cl = 70.9 g/mol
Mole of Cl =.?
Mole = mass /molecular weight
Mole of Cl = 355 /70.9
Mole of Cl = 5 moles
Next, we shall convert 30 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Temperature (T) = 30 °C
Temperature (T) = 30 °C + 273 = 303 K
Finally, we shall determine the pressure of the gas as illustrated below:
Volume (V) = 70.0 L
Number of mole (n) = 5 moles
Temperature (T) = 303 K
Gas constant (R) = 0.0821 atm.L/Kmol
Pressure (P) =?
PV = nRT
P × 70 = 5 × 0.0821 × 303
P × 70 = 124.3815
Divide both side by 70
P = 124.3815 / 70
P = 1.78 atm
Therefore, the pressure of the gas is 1.78 atm
The pressure of the gas in atmospheres if it's temperature is 30.0 degrees celcius is 1.77 atm.
How do we calculate pressure?Pressure of the given gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure of chlorine gas = ?
V = volume of chlorine gas = 70 L
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature chlorine = 30 degree celsius = 303 K
n is the moles of gas which can be calculated as:
n = W/M, where
W = given mass of chlorine gas = 355g
M = molar mass of chlorine gas = 70.9g/mol
n = 355/70.9 = 5 moles
On putting all these values on the above equation and calculate for P, we get
P = (5)(0.082)(303) / 70
P = 1.77 atm
Hence required pressure is 1.77 atm.
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What type of weather fronts are close to New York
The climate of New York is continental, with cold winters and hot summers. The daily average temperature ranges from 0.5 °C (33 °F) in January to 24.5 °C (76 °F) in July.
(hope this helps ^^)
Which is the correct formulae for ammonia
Answer:
NH3
Explanation:
Which characteristic describes the troposphere?
PLS HELP
Answer:
hope it helps..
Explanation:
The troposphere forms the lowest level of the Earth's atmosphere, extending down to the surface of the Earth. This layer also features the heaviest weight of all Earth atmosphere layers, comprising approximately 75 percent of the total atmospheric weight. The troposphere varies in thickness and height around the world.
explain why the troposphere has a larger total mass in the stratosphere even though the stratosphere so much bigger
Answer:
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place. It contains 75% of the atmosphere's mass and 99% of the total mass of water.
Explanation:
the sun provides the earth with
Answer:
heat and light
Explanation:
Answer:
Sunlight, and weather
Explanation:
Pls mark brainliest if this helps
For dessert, she prepares to bake a delicious apple pie. During one of the steps, she
notices an example of a chemical change. Which one is it?
O heating sugar to make caramel
softening butter
O folding a sheet of aluminum foil
dicing an apple
Answer:
heating the sugar
Explanation:
Answer:
softening butter...
Explanation:
that sounds the best because the butter be melting
Sort the metric system prefixes into the correct order, smallest to largest.
deci-
centi-
deca-
hecto-
milli-
kilo-
Answer:
mili
hecto
deci
deca
centi
kilo
Explanation:
Answer:
milli-
centi-
deci-
deca-
hecto-
kilo-
Using the balanced equation given below, calculate the number of moles of KCIO3 that should be reacted to produce 5.50 moles of KCI. ___ moles KCIO3
*your answer should be written as X.XX
2KCIO3 —> 2KCI + 3O2
(Please answer asap!)
Answer:
5.50 mil KCI * 2 mol KCIO3 / 2 mil KCI
I don’t know the answer, but my teacher gave me the steps to solve it...
Explanation: