Question

The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table.; Answer the following questions, giving justification in each case:; (i) Write the group to which these elements belong.; (ii) Name the least reactive element.; (iii) Name the element having largest atomic radius.(All India - 2014)

Answer 1

Answer:

(1) Group of

Be and Mg and Ca is 2

(2) The least reactive metal is Be

(3) Thr element having largest size is Ca

Explanation:

Explanation of 3 question.

(3) The calcium have electronic configuration (2,8,8,2)

Electronic configuration of Mg is (2,8, 2)

Electronic configuration of Be there s (2, 2)

In shell of all three element calcium have four she'll and magnesium have three shells and beryllium have two shells .Therefore the atomic size of the calcium is bigger because it have 4 shells

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