Electronic configuration of elements P, Q, R and S are given below:
P - (2, 2)
Q - (2, 8, 2)
R - (2, 8, 5)
S - (2, 5)
Which of the following options is correct? [1mark]
A. P and Q belong to second period and R and S belong to third period.
B. P and R belong to second period and Q and S belong to third period.
C. S and Q belong to second period and R and P belong to third period.
D. P and S belong to second period and R and Q belong to third period.

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Solution

Coorect answer: Option D. P and S belong to second period and R and Q belong to third period.

The period numbner of any element is determined by the number of shells.
Period number of P = No. of shells = 2
Similarly, for others
Period number of Q = 3
Period number of R = 3
Period number of S = 2

So, P and S belong to second period and R and Q belong to the third period.

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The element A and B have an electronic configuration (2, 8, 18, 2) and (2, 6) respectively.

(1)To which period do A and B belong?

(2)To which groups A and B belong?

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Arrange the elements mentioned below in the order of maximum:

(A) Metallic character (B) Electronegativity

(i) A belongs to the first period and the $18$ ^th group.

(ii) B belongs to the $6$ ^th period and the first group.

(iii) C belongs to the third period and the $17$ ^th group.

(iv) D belongs to the second period and $17$ ^th group.

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