Nitrogen is the element of group-VA of the periodic table. Which of the following is the atomic number of the next element in the group?

i. La and Hg both belongs to period 6.  Therefore,  n = 6. ii. Elements of group 3 to group 12 belong to the d-block of the modem periodic table. iii. The general outer...

Hydrogen is the first element in the periodic table.

\(_Z^AA \overset{\propto-Emission}\longrightarrow\) \(_{Z-2}^{A-4}B\) + \(_2^4He\)  When α-emission occurs, atomic number decreases by 2 and atomic mass number by 4.  Thus,  If ‘B’ belongs to group 16 of periodic table, that means outermost orbit will contain 6...

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

Correct option is  A) 2

Correct option is  B) 14

D) P – S, Q – U, R – T

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.