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Worksheet: Valency

Q1:

The valence shell of boron is the second electron shell and contains 3 electrons. How many covalent bonds can boron form by sharing its electrons?

Q2:

Hydrogen has a single electron in its valence shell. How many covalent bonds can it form?

Q3:

The valence shell of oxygen is the second electron shell and contains 6 electrons. How many covalent bonds can oxygen form?

Q4:

The valence shell of carbon is the second electron shell and contains 4 electrons. How many covalent bonds can carbon form?