Question

Assertion (A): The valency of aluminium is 3 and oxygen is 2.

Reason (R): The chemical formula of aluminium oxide is Al3O2​

Answer 1

Answer:

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Explanation:

Answer 2

Assertion (A): The valency of aluminum is 3 and oxygen is 2.

Reason (R): The chemical formula of aluminum oxide is Al3O2​

Both Assertion and Reason are correct but (R) is not the right reason for (A).

• Valency is the number of chemical bonds an element can bond with other atoms.
• Aluminum has an atomic number 13 with an electronic configuration 1s2 2s2 2p6 3s2 3p1. Aluminum has an energy level of 3 making it have 3 valence electrons. So we can say that aluminum can have 3 chemical bonds with other atoms. It forms +3 ions.
• Oxygen has an atomic number 8 with an electronic configuration 1s2 2s2 2p6. Oxygen has 6 valence electrons in the end shell and an energy level of 2 making it have 2 valence electrons. So we can say that oxygen can have 2 chemical bonds with other atoms. It forms -2 ions.

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