Question

A, B, C,D are four elements with atomic numbers 3,12,17 and 19 respectively-

1> Which of these cannot form ionic bonds

2> Which of these cannot form covalent bonds

3> Give the formula of the compound that hydrogen forms with A and C

4> which of these are metals, nonmetals or inert gases

Answer 1

Element A with atomic number 3 = Li,

B, atomic number 12 = Mg

C,atomic number 17 = Cl

D, atomic number 19 = K

1) All of them can form ionic bond.

2) Except Cl no one can from covalent bond. This is due to the fact that others are metals.

3) With A,

heat

2 Li + H₂ --------> 2 Li⁺H^-

With C,

H₂ + Cl₂ ----------> 2 HCl

4) Metals= Li, Mg, K

Non metals = Cl

Hope you got it!