Question

If an element A has 3 shells and has 3 valence electrons, write formulas for the following:

a. Nitrate of A

b. Chloride of A

c. Oxide of A

Answer 1

Electron configuration

an element A has 3 shells and has 3 valence electrons

so electron configuration of A: 1s², 2s², 2p⁶, 3s², 3p¹

will tend to lose 3 electron to form a cation: A³⁺

a. Nitrate of A

A(NO₃)₃

b. Chloride of A

ACl₃

c. Oxide of A

A₂O₃