Question

Number of electrons lost by atoms of group |||A equal

Answer 1

Answer:

3 electron

Explanation:

For example, lets take boron at the first of the IIIa

As its atomic no is 5. to obey octet rule the first shall should have 2 electrons and the second shell should have 8 electrons for obeying in it have to gain 5 electrons or lose 3 electrons. Losing 3 electrons is easy as it requires very little energy.  So it have to lose 3 electrons. As it loses 3 electrons it is positively charged and it is a metal.