Valency Revealed Group IV Elements' Complex Chemistry

The video tutorial explains valency as the combining capacity of an element, focusing on Group 4 elements, which have a valency of four due to their electronic configuration. Carbon, a Group 4 element, forms four covalent bonds to achieve a stable octet configuration, as seen in compounds like methane and carbon dioxide. The video also discusses the challenges in forming carbon anions due to carbon's low electronegativity and the inability of its nucleus to hold additional electrons.

What is the valency of Group 4 elements, and why?

• Six, because they can form six bonds.

• Eight, because they have a full octet.

• Four, because they have four electrons in their valence shell.

• Two, because they have two electrons in their valence shell.

How does carbon achieve a stable octet configuration?

• By losing four electrons.

• By forming four covalent bonds.

• By forming two covalent bonds.

• By gaining four electrons.

In methane, how many covalent bonds does carbon form?

• Two

• Three

• Five

• Four

Why is it difficult for carbon to form a 4 minus anion?

• Because carbon's nucleus cannot hold 10 electrons effectively.

• Because carbon has a high electronegativity.

• Because carbon prefers to lose electrons.

• Because carbon has a full octet naturally.

What is the electronegativity of carbon?

• 1.0

• 2.5

• 3.5

• 4.0