Which of the following compounds has an atom with an unfilled valence shell of electron h20 co2 ch4 bci3

The compound in which the atom has unfilled valence shell of electron is

Explanation:

Valence electrons is defined as the electrons which are present in the outermost shell of an atom.

Lewis-dot structure is defined as the structure which represents the number of valence electrons around the atom. The dots represents the electrons.

For the given options:

In the given compound, 2 electrons are shared between oxygen and each hydrogen atom. From the lewis dot structure,

Valence electrons in each hydrogen atom = 2

Valence electrons in oxygen atom = 8

The valence shell of both the elements is complete.

In the given compound, 4 electrons are shared between carbon and each oxygen atom. From the lewis dot structure,

Valence electrons in each oxygen atom = 8

Valence electrons in carbon atom = 8

The valence shell of both the elements is complete.

In the given compound, 2 electrons are shared between carbon and each hydrogen atom. From the lewis dot structure,

Valence electrons in each hydrogen atom = 2

Valence electrons in carbon atom = 8

The valence shell of both the elements is complete.

In the given compound, 2 electrons are shared between boron and each chlorine atom. From the lewis dot structure,

Valence electrons in each chlorine atom = 8

Valence electrons in boron atom = 6

The valence shell of boron is not complete and has incomplete octet.

Hence, the compound in which the atom has unfilled valence shell of electron is

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).