Question

The number of elements in the 5th period of the periodic table is(a) 2 (b) 8 (c) 32 (d) 18

Answer 1

Answer:

18

Explanation:

elements: 2in s-orbitals , 10in p-orbitals nd 6 in d-orbitals.

Answer 2

Answer:

The number of elements in the 5th period of the ‘periodic table is 18’.

Explanation:

• “Periodic table” can be classified into four different blocks they are s,p,d and f.  
• The number of groups in s- block is 2, the number of groups in p – block is 6, the number of groups in d–block is 10 and the number of groups in f- block is 14.

• The periodic table has 7 periods and 18 groups.
• The number of elements in the periods are 2,8,8,18,18,32 and 26 respectively.