Which ray when emitted by a radio element does not change its atomic number?

This transition element with the lowest atomic number is

Show that the equivalent mass of an element cannot be greater than its atomic mass.

To which block does the element with atomic number 50 belong?

The atomic mass of an element is 24 and its atomic number is 12. Show how the atom of the element is constituted?

Because of lanthanide contraction, which of the following pairs of elements have nearly same atomic radii (Number in the parenthesis are atomic numbers)-

The elements with atomic numbers 31 belongs to :

How many alpha and beta particles will be emitted by an element 84^(A^(218)) is changing to a stable isotope of 82^(B^(206))

A non zero current passes through the galvanometer G shown in the circuit when the key K is closed and its value does not change when the key is opened. Then which of the following statement(s) is /are true?