Question

Given below are some elements of the modern periodic table:
₄Be, ₉F, ₁₄Si, ₁₉K, ₂₀Ca
(a) Select the element that has one electron in the outermost shell and write its electronic configuration.
(b) Select two elements that belong to the same group. Give reason for your answer.
(c) Select two elements that belong to the same group. Which one of the two has bigger atomic size?

Answer 1

Answer:

Explanation:

(a) ₁₉K (potassium) has one electron in its outermost shell.

      Electronic configuration: 1s²2s²2p⁶3s²3p⁶4s¹

(b) ₄Be and ₂₀Ca belong to the same group

     Reason:  both have 2 valence electrons

(c) ₄Be and ₂₀Ca belong to the same group, ₂₀Ca has bigger atomic size than ₄Be.

I guess you meant same period in this question (anyways have answered both)

    ₁₉K, ₂₀Ca belong to the same period and ₁₉K has bigger atomic size than  ₂₀Ca

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Answer 2

Explanation:

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