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GREYUIT [131]
3 years ago
13

an atom has an atomic number of 9 a mass number of 19 and an electron configuration of 2-6-1 explain why the number of electrons

in the second and third shells shows that this is in an excited state
Chemistry
1 answer:
sukhopar [10]3 years ago
5 0
You can tell that the atom is in the excited state because:

- Electron configuration should follow the 2-8-8-2 rule, meaning that the inner shell should be filled before the next shell can start holding electrons.

- Instead of the atom's electron configuration being in the ground state at 2-8-8-1, electrons from the second shell have jumped to the third.
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In the crystal structure of potassium oxide, the oxide ions are coordinated by eight potassium ions. part a what is the coordina
Ugo [173]
Potassium oxide has the antifluorite structure. The antifluorite structure have compounds with the stoichiometry X₂Y, where X is the cation and Y is the anion. In the antifluorite structure <span>positions of the </span>cations<span> and </span>anions<span> are reversed relative to their positions in calcium fluoride.</span>
Potassium ions coordinated to 4 oxide ions, <span>potassium ions are all in the tetrahedral holes.</span>
5 0
3 years ago
`Let's just consider the concept of stoichiometry without any confusing chemicals. Here is a generic equation: 2A + 6B ? 3C. If
lesya [120]

Answer:

Option D. 5.5

Explanation:

The equation is this:

2A + 6B  ⇒  3C

With the amounts that we were given, let's determine which is the <em>limting reactant</em>

2 A reacts with 6 B

4 A will react with ( 4 .6)/2 = 12B

I have 11 B, so the limiting is B

6 B react with 2 A

11 B will react with (11 .2 )/6 =3.66 A

I have 4 A, so A is the excess.

6 B produce 3 C

11 B will produce ( 11 .3)/6 = 5.5C

7 0
3 years ago
How many grams of Cl are in a 38.0-g sample of the chlorofluorocarbon CF2Cl2
Katena32 [7]
The molecular formula of chlorofluorocarbon is CF₂Cl₂ 
Molecular mass of CF₂Cl₂ is 120.9 g/mol
Mass of Cl in 1 mol - 2 x 35.5 = 71 g/mol
in 120.9 g of compound - 71 g of Cl
Therefore in 38 g of sample - 71/120.9 x 38 g of Cl
Mass of Cl in 38 g - 22.31 g of Cl
4 0
3 years ago
I need it done assapp
Alja [10]

Answer:

water molecules

Explanation:

4 0
3 years ago
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The bond energy between carbon and oxygen is 358 for a single bond (C-0) and 745 for a double bond (C=0). Why is the bond energy
steposvetlana [31]

As  Bond energy is between carbon and oxygen the is 358 for a single bond of C-0 and 745 for a double bond is the  c=0.

  • In the first step the one atom pulls the electron from another atom . In the second step that is forming bonds releases energy and is the exothermic . In the third step they pull electrons away from other elements .
  • In the last step the additional bonds is needed more energy to make or break, so the bond energy is very higher  Hence the  -153.

Learn more about the energy between carbon and oxygen is 358.

brainly.com/question/26244428.

7 0
2 years ago
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