Q5 of 27 Page 62

Electronic configurations of elements P, Q, R and S are given below. (These are not actual symbols).

P — 2, 2


Q — 2, 8, 2


R — 2, 8, 5


S — 2, 8


Which among these elements are included in the same period?

Elements Q and R are included in the same period.

Element P and S are included in the same period.


In Q (2,8,2) and R (2,8,5), there are three shells


present. Hence, they both belong to third period.


In P (2,2) and S (2,8), there are two shells present. Hence they both belong to second period.


More from this chapter

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4

There are three shells in the atom of element ‘X’, 6 electrons are present in its outmost shell.

To which family of element does is this element belong to?

 4

There are three shells in the atom of element ‘X’, 6 electrons are present in its outmost shell.

Draw and illustrate the Bohr atom model of this element.

 5

Electronic configurations of elements P, Q, R and S are given below. (These are not actual symbols).

P — 2, 2


Q — 2, 8, 2


R — 2, 8, 5


S — 2, 8


Which are those included in the same group?

 5

Electronic configurations of elements P, Q, R and S are given below. (These are not actual symbols).

P — 2, 2


Q — 2, 8, 2


R — 2, 8, 5


S — 2, 8


Which among them is a noble gas?