Question

two elements A and B belong to the third period and are in group 2 and 13 respectively? compare their following characters in tabular form
1. no. of electrons in the atom
2. size of atom
3. tendency to losse electrons
4. formula of their oxides
5. formula of their chlorides

Answer 1

two elements A and B will be Magnesim and aluminium
no. of electrons in magnesium = 12
no. if electron in aluminum = 13
magnesium will loose electron easily
magnesium oxide = MgO
aluminum oxide = Al2O3
magnesium chloride = MgCl2
Aluminium chloride
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