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Q.

The elements with the atomic numbers 10, 18 belong to the:


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a

Same period

b

Same group

c

Different periods

d

None of the above. 

answer is B.

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Detailed Solution

Concept- Atomic number of an element is equal to the number of protons (number of electrons) of the neutral atom of the element.  All the elements are arranged in the order of atomic number and this arrangement is called the modern periodic table.
A modern periodic table has 7 periods (rows) and 18 groups (columns).
Entire elements from a similar group have the same number of valence electrons.
Now, the electronic configuration of the element with atomic number 10 is 2, 8  . And the electronic configuration of the electron with atomic number 18 is 2, 8, 8  .  As both the elements have the same number of valence electrons (8), they belong to the same group.
Hence, the correct option is 2.
 
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