Question

The elements A,B,C,D and E have Atomic number 2,3,7,10,18 respectively.The element which belongs to the same period of the periodic table are :
a) A,B,C
b) B,C,D
C) A,D,E
d) B,D,E​

Answer 1

Answer:

the answer is option b) B,C,D

Explanation:

The first period contains 2 elements. The second period contains 8 elements. The third period contains 8 elements. Therefore, the first period contains 1−2 atomic number. The second period contains 3−10 atomic number. The third contains 11 to 18 atomic number. The fourth period contains 19 to 36 atomic number. 

So B, C, D belong to the same period.

Hence, the correct option is B

Answer 2

Answer:

Yes the answer is b option