The elements with atomic number 10, 18 belong the:

same period

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same group

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different periods

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none of these

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Solution

The correct option is C same group
The elements of atomic number $10$ and $18$ are Neon ( $N e$ ) and Argon ( $A r$ ) respectively. Both of them are inert gases and belong to eighteenth group. Thus they belong to the same group and are placed one below other so to different periods.

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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?

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