Question

Can someone please tell me the answers for this?

Answer 1

Answer:

1 the symbol C represents carbon atom of atomic number 6 and mass number 12

2 .

a. A^ -1

b non metal

3

a. Z= 18

because atomic number Z = number of electrons = no of protons

b. mass number = 18 +20 = 38

c Argon

d. Chlorine ion

4

a. atomic number of X = 12 = number of electrons

mass number = atomic number+ number of neutrons = 24

Electronic Configuration is 2,8,2

Valency = 2

b , Metal , because it's valency is 2 so it can lose electrons