Elements in group 1a all:

a. gain 1 electron

b. lose 1 electron

c. are non-metals

d. have 2 energy levels

The answer to your question is below

Explanation:

Elements in group 1A all:

a. gain 1 electron   This option is wrong, elements in group 1A loses one electron.

b. lose 1 electron  This option is right.

c. are non-metals  This option is incorrect, elements in group IA, are metals.

d. have 2 energy levels This option is incorrect, only one element in each group has 2 energy levels.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate