A pair of atomic numbers which belong to s-block are _________.

7, 15

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6, 12

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9, 17

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3, 12

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Solution

The correct option is C 3, 12
Atomic number 3 is lithium belongs to 1 group.
Atomic number 12 is magnesium which belongs to 2 group.
Both 1 and 2 groups belongs to s-block.

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Similar questions

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

A, B, C, D a n d E

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