Question

What is the valency of silicon positive valency or negative valency?…………

Answer 1

it shows tetravent.
to complete their octate its either need to Loose 4 electrons organ for electrons , but this acquires high amount of energy . so it sharing their electrons

Answer 2

The number of electrons in an atom is always the same as the number of protons, so atoms are electrically neutral over all. Atoms can loss or gain electrons. If an atom gains one or more electrons, it becomes a negativity changed ions.