Question

1. How many valence electrons are in the following: N 2. Tell if these will become anions or cations. ca Mg. 3. If pH changes from 6 to 9 how much more basic is the solution? Will it have more or less H* in it than the original solution? 4. How many electron shells would have around the nucleus? 5. What is the atomic number of P? Nitrogenous base NH, 6. The molecule NaCl forms when Nat and Clare attracted to the other. Phosphate group This is called an bond. -0--0-CH, O- 7. The molecule to the right is OH in RNA OH Sugar H in DNA

Answer 1

1. Potassium - 19

K, L, M = 2.8,9

Valence electrons are the outer electrons hence potassium has 9 electrons.

Carbon - 6

K,L,M - 2,4

Nitrogen- 7

K,L,M- 2,5

Boron- 5

K,L - 2,3

2. calcium -20

K, L,M -2,8,8,2

It will donate 2 electrons hence it will become cation.

Bromine- 35

Ar] 3d¹⁰4s²4p⁵

It receives electrons hence it is anion.

Magnesium - 12

K,L,M -2,8, 2

It donates electrons hence it is a cation.

3. 7 is the neutral pH and 9 is the basic pH.

Ph = - log H+

Because it is basic hence it will have less H+ ions.

4. K or potassium has atomic number 20 hence its electronic configurations is -

2,,8,8,2. hence it has 4 shells.

5. Atomic no. of phosphorus is 15

6. Ionic bond

7. Adenosine ribonucleotide.