4 because it's electron configuration is 1s2 2s2 2p2 and to have a full outer valence shell you need 2p6 so you only need 4 more electrons to get to 2p6.
Well you didnt give me enough information so i cant really answer your question
Answer:
Noble gases cannot form compunds as they have completely filled orbitals and have stable noble gas configuration
♥ Mixture refers to any substance which is composed of molecules of different types.
♥ The different elements and compounds in the mixture retain their original physical properties even after combining to form a mixture.