Question

3. The number of electrons of some elements is given here. By using it write the electron configuration, number of valence electron and valency of the respective elements. Element Li С Mg O 3 6 12 8. Number of electrons Electronic configuration Number of valence electrons Valency 2 o 2 8 b 0​

Answer 1

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Answer 2

Lithium

• Electronic configuration: (2,1)
• Number of valence electrons: 1
• Valency: 1

Carbon

• Electronic configuration: (2,4)
• Number of valence electrons: 4
• Valency: 4

Magnesium

• Electronic configuration: (2,8.2)
• Number of valence electrons: 2
• Valency: 2

Oxygen

• Electronic configuration: (2,6)
• Number of valence electrons: 6
• Valency: 2

Explanation:

Number of electrons:

• Number of electrons in any atoms is equal to the number of protons and that is its atomic number.

Electron Configuration:

• Electrons revolve around the nucleus in orbits. These orbits are referred as shells.
• Electron configuration of any element is used for describing the distribution of electrons in the shells.
• Basic electron configuration is illustrated as the number of electrons in each shell.

Valence Electron:

• Number of electrons in the outermost shell are called valence electrons.
• Valence electrons decides the valency and reactivity of any element.
• Lithium has 1 electron in outermost shell, carbon has 2 electrons, Magnesium has 2 electrons and oxygen has 6 electrons in outermost shell.

Valency:

• Valency is the number of electrons required by an atom to complete its octet rule.
• It is the tendency of an atom to combine with another atom.