3. A full octet (8 electrons) is needed to be stable. So if the atom gets 3 more atoms it will be stable.
Answer:
Plantae. Plants are multicellular and most don't move, although gametes of some plants move using cilia or flagella. Organelles including nucleus, chloroplasts are present, and cell walls are present. Nutrients are acquired by photosynthesis (they all require sunlight).
1p is not possible because it goes like this 1s2 2s2 2p6