Question

Explain with examples (i) atomic number (ii) mass number (iii) isotopes and (iv) isobars . Give any two uses of isotopes .

Answer 1

it is the number of element in periodic table
it is the mass of element
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
each of two or more isotopes of different elements, with the same atomic weight.

Answer 2

Atomic No.

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

2) Mass no

the sum of the total number of protons and neutrons in a nucleus

3) isotopes

. Isotopes are atoms of the same element having the same atomic numbers, but different mass numbers.

4) isobar

Isobars are atoms of different elements having different atomic number but same mass number.