Question

Match the element with its number of valence electrons.

Answer 1

Answer:

Valence electrons are that electrons that are present in the atom, outside the nucleus in orbits. The list of atoms with correct number of valance electrons is as follows;

A. Nitrogen: 5

B. Silicon: 4

C. Oxygen: 6

D. Magnesium: 2

Answer 2

Answer :

Element            Valence electrons

Nitrogen                         5

Silicon                            4

Oxygen                          6

Magnesium                    2

Explanation :

Valence electrons : Valence electrons are the electrons which is present on the outermost shell of the electron.

The given element is nitrogen that belongs to group 15 and the atomic number 7.

The number of electrons present on nitrogen element are 7.

The electronic configuration of nitrogen element is,

$1s^22s^22p^3$

The number of valence electrons present on nitrogen element are, 5.

The given element is silicon that belongs to group 14 and the atomic number 14.

The number of electrons present on silicon element are 14.

The electronic configuration of silicon element is,

$1s^22s^22p^63s^23p^2$

The number of valence electrons present on silicon element are, 4.

The given element is oxygen that belongs to group 16 and the atomic number 8.

The number of electrons present on oxygen element are 8.

The electronic configuration of oxygen element is,

$1s^22s^22p^4$

The number of valence electrons present on oxygen element are, 6.

The given element is magnesium that belongs to group 2 and the atomic number 12.

The number of electrons present on magnesium element are 12.

The electronic configuration of magnesium element is,

$1s^22s^22p^63s^2$

The number of valence electrons present on magnesium element are, 2.