Question

An element X belong 3rd period and 13th group of modern periodic table. 1. Determine the valance electron of X 2. Molecular formula of the compound formed when X reacts with element Y (atomic number =8) 3. write the name and formula of the compound formed when X combines with chlorine

Answer 1

3+ is the valency
Al is X
Al+ O2 -> Al2O3
Al + Cl2 -> AlCl3

Answer 2

1. Electronic configuration 2, 8 , 3
Valence electrons 3
2. Aluminium + oxygen gives Aluminium oxide
Al3 + O2 gives Al2O3
3. Aluminium + chlorine gives aluminium chloride
Al3+ cl2 gives al2cl3