Question

Sodium and aluminium have atomic numbers 11 and 13,
respectively. They are separated by one element in the
periodic table, and have valencies 1 and 3 respectively.
Chlorine and potassium are also separated by one element in
the periodic table (their atomic numbers being 17 and 19,
respectively) and yet both have valency 1. Explain.​

Answer 1

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Sodium and Aluminium have same atomic number 11 and 13 respectively. They are separated by one element in the periodic table and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by 1 element in the periodic table and yet they both have valency 1 .

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