On the basis of electronic configuration how will you identify the first element in a period?
[TEXTBOOK QUESTION- 3(2)]

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Solution

If the number of valence electron is 1 then the element is said to be the first element of a period, If the number of valence electrons are 8, the element is said to be the last element of a period.

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Similar questions

(a) What is the fundamental difference in the electronic configurations between the group 1 and group 2 elements?

(b) On the basis of electronic configuration, how will you identify :

(i) chemically similar elements?

(ii) the first element of a period?

Question 16

The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations.

A $1 s^{2}$ $2 s^{2}$ $2 p^{6}$

B $1 s^{2}$ $2 s^{2}$ $2 p^{6}$ $3 s^{2}$ $3 p^{3}$

C $1 s^{2}$ $2 p^{6}$ $2 p^{6}$ $3 s^{2}$ $3 p^{5}$

The molecular formula of the compound formed from B and C will be

(a) BC

(b) $B_{2} C$

(d) $B C_{3}$

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