The following table represents the first 20 elements of the Periodic table (the symbol and the electronic configuration for the outermost shell for each of the 20 elements are given).
IA 0
H
1
IIA IIIA IVA VA VIA VIIA
He
2
Li
2,1
Be
2,2
B
2, 3
C
2,4
N
2,5
O
2,6
F
2,7
Ne
2,8
Na
2,8,1
Mg
2,8, 2
Al
2,8,3
Si
2,8,4
P
2,8,5
S
2,8,6
Cl
2,8,7
Ar
2,8,8
K
2,8,8, 1
Ca
2,8, 8, 2

Nitrogen has _____ electrons in its outermost shell.

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Solution

Valence electrons of an element are defined as the number of electrons present in the outermost shell of that element.
Valence electrons in any element in Group 1, 2, and 13 to 18 can be predicted by its Group number. Example, elements in Group 1 or Group IA have 1 valence electron.
According to the electronic configuration of Nitrogen (2, 5), the electron present in its outermost or valence shell (second shell) is 5.
Thus, Nitrogen (N) has 5 electrons in its outermost shell.

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Similar questions

Given below are some elements of the modern periodic table:

_{$4^{B e}, 9^{F e}, 14^{S i}, 19^{K}, 20^{C a}$}

(i)Select the element that has one electron in the outermost shell and write its electronic configuration.

(ii)Select two elements that belong to the same group. Give reason for you answer.

(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size?

Outermost electronic configuration of least electro negative element in the periodic table is

Name

(a) three elements that have a single electron in their outermost shells.

(b) two elements that have two electrons in their outermost shells.

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