Question

Is the only element in group 1 on the periodic table that forms covalent bonds.

A) hydrogen
B) lithium
C) potassium
D) sodium

Answer 1

Answer: A) hydrogen

Explanation: Covalent bonds are formed by sharing of electrons whereas ionic bonds are formed by transfer of electrons.

Hydrogen is an element with atomic number of 1 and thus contain 1 electron.

`H:1:1s^1`

It can only share electrons to attain stable configuration as on losing the electron it wont exist.

Lithium is an element with atomic number of 3 and thus contain 3 electrons.

`Li:3:1s^22s^1`

It can lose 1 electron to attain stable configuration.

Potassium is an element with atomic number of 19 and thus contain 19 electrons.

`K:19:1s^22s^22p^63s^23p^64s^1`

It can lose 1 electron to attain stable configuration.

Sodium is an element with atomic number of 11 and thus contain 11 electrons.

`Na:11:1s^22s^22p^63s^1`

It can lose 1 electron to attain stable configuration.

Answer 2

The element in group 1 on the periodic table that form a covalent bonds is hydrogen (answer A)

Explanation

• A covalent bond is a bond which formed when their is sharing of electron between atom.

• Mostly covalent bond is formed between two non metals

1. Hydrogen is the only non metal in group 1 therefore it is the only element in group 1 that form covalent bond.