Question

1. State the valency of aluminium in AL2O3.
2.The atomic number of an element is 15 .Find the number of valence electrons in its atom .Predict the valency of the element.
3.out of the elements 35cl and 40 Ar. Which is chemically more reactive and why ?​

Answer 1

Answer:

Valency of an atom is the number of electrons that are required to be added or removed from the outermost shell of an atom to complete its octate.

Alumunium has an atomic number (Z) of 13

So, its electronic configuration is [Ne] 3s

2

3p

1

Hence, it needs to lose 3 electrons to attain stable configuration, hence its valency is three.

Oxygen has an atomic number (Z) of 18

So, its electronic configuration is [He]2s

2

3p

1

.

therefore, it needs to gain more electrons to attain stable ocate. Hence, its valency is 2

Explanation:

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