What is valence electrons.

What is valency

Name three elements with seven valence electrons in their outermost shell. How do their non-metallic character and atomic size change down the group?

Lithium is an alkali metal with atomic number = 3 and number of valence electrons = 1. The formula of the hydride of lithium is LiH. Boron and carbon are placed in group 13 and 14 respectively with valence electrons 3 and 4. Write the formulae of the hydrides of boron and carbon giving a reason for your answer.

Carbon forms covalent bonds by sharing its four valence electrons with four univalent atoms , e.g, hydrogen . After the formation of four bonds, carbon attains the electronic configuration of

To get n -type doped semiconductor, impurity to be added to silicon should have the following number of valence electrons

If x denotes the number of valence electrons of the element, then its valency is equal to: