Learning of 16 July 2021

Learning Objective:

Activity: To understand the relation between valency and group number of elements in the Periodic Table

Write the electronic distribution of element (1 to 20) following the octet rule.
Circle the valence electrons for the elements - Each with a different color
Now group the elements with same valence electrons in a group and arrange them in ascending order.
Check the periodic table if it follows the same pattern

Octet Rule:

1. Maximum possible electrons in the first shell is 2.

(2n^2 where n is the shell number)

2. The outermost or the last shell cannot have more than 8 electrons

My Answer:

Hydrogen (H) - 1; 1

Helium (He) - 2; 2

Lithium (Li) - 3; 2,1

Beryllium (Be) - 4; 2,2

Boron (B) - 5; 2,3

Carbon (C) - 6; 2,4

Nitrogen (N) - 7; 2,5

Oxygen (O) - 8; 2,6

Fluorine (F) - 9; 2,7

Neon (N) - 10; 2,8

Sodium (Na) - 11; 2,8,1

Magnesium (Mg) - 12; 2,8,2

Aluminum (Al) - 13; 2,8,3

Silicon (Si) - 14; 2,8,4

Phosphorous (P) - 15; 2,8,5

Sulfur (S) - 16; 2,8,6

Chlorine (Cl) - 17; 2,8,7

Argon (Ar) - 18; 2,8,8

Potassium (K) - 19; 2,8,8,1

Calcium (H) - 20; 2,8,8,2

-> The valency of electrons are same as to the number of the group.

For example: Beryllium, Magnesium, and Calcium all come under group 2, and their valency's are 2.

- Mirage Chemistry

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