Question

How many electrons must element 4 (Be) gain or lose to get an electron configuration similar to a noble gas?

A. lose 2 electrons
B. lose 1 electron
C. gain 2 electrons
D. gain 1 electron

Answer 1

berillium has 4 electrons , 2 in its first shell and 2 in its second shell(which is the outermost )
so it should either lose 2 electrons to become \[Be ^{2+}\] or it should gain 6 electrons to complete its second shell.
its more practical and easier to lose 2 electrons
berillium loses 2 electrons to have a configuration as that of the noble gas helium(2)

Answer 2

Thank you!