Carbon (Z=6) is the element of group-IVA of periodic table. Which of the following is the atomic number of next number in the group 

An atom of an element ‘X’ having atomic number ‘Z’ and atomic mass number ‘A’ is represented as : \(^A_ZX\) 

Correct option is  C) 15

D) a → iii, b → i, c → iv, d → ii

Correct option is  A) 2

(a) Ratio of neutrons to protons is 2.3: 1 which is not the stable ratio of 1:1 (b) Age of fossils can be estimated by C-14 decay. All living organisms have...

Correct option is A) 12.01

i. First period  ii. f-Block

Correct option is : (D) proton number The serial number of an element in Mendeleev's periodic table was recognized as proton number.

Correct Answer - `98.9%`