1.
Element | Period | Group | Valency | Metal/Non-metal | Block |
A | 3 | I A | 1 | Metal | S-block |
B | 4 | I A | 1 | Metal | S-block |
B | 3 | VII A | 1 | Non-Metal | P-block |
2.
The elements are:
A- Sodium (Na)
B- Potassium (K)
C- Chlorine (Cl)
3.
A and C form NaCl.
B and C form KCl.
4.
NaCl and KCl are ionic or electrovalent compounds because they have ionic or electrovalent bong.
5.
B is more reactive than A because B has larger size, less nuclear power and hence it loses electron easily than A.