Question

Why is lithium with atomic number 3 and potassium with atomic number 19 are placed in group one? What
will be atomic number of the first two elements in the second group?​

Answer 1

Explanation:

Lithium : Atomic number – 3(2, 1); Sodium : Atomic number – 11(2, 8, 1); Potassium : Atomic number – 19(2, 8, 8, 1). ... The atoms of lithium, sodium and potassium all have only one electron in their outermost shells and all of these are metals. All of these react with water to form alkalies.

Answer 2

Explanation:

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