Given below are some elements of the modern periodic table : 4Be, 9F, 14Si, 19K, 20Ca.

Question

Given below are some elements of the modern periodic table : 4Be, 9F, 14Si, 19K, 20Ca.

Given below are some elements of the modern periodic table :

₄Be, ₉F,₁₄Si, ₁₉K, ₂₀Ca.

(i) Select the element that has one electron in the outermost shell and write its electronic configuration.

(ii) Select two elements that belong to the same group. give reason for your answer.

(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size ?

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

(i) ₁₉K (Potassium) is the element that has one electron in the outermost shell.

Electronic configuration = 2,8,8,1

(ii) ₄Be (Beryllium) and ₂₀Ca (Calcium) belong to the same group because they have same number of valence electrons.

Be=2,2 and Ca = 2,8,8,2

(iii) Beryllium (Be) and Fluorine (F) have the same period i.e., a second period which has 2 shells (K and L) whereas Potassium (K) and Calcium (Ca) also belong to same period i.e., the fourth period which has 4 shells (K, L, M and N).