Question

Explain with examples (i) Atomic number (ii) Mass number (iii) Isotopes.​

Answer 1

Answer:

Atomic Number: The number of the protons present in the nucleus of an atom is called atomic number. ... ii) Mass number is the number of protons and neutrons in the nucleus taken together. For example, mass number of sodium is 23 g/mol. iii) Isotopes are elements with the same atomic number but different mass numbers.

Answer 2

Answer:

(I) atomic number :-

number of protons and electrons in an atom.

eg :- Ca has 20 as atomic number as it has 20 electrons

(II) mass number :-

the sum of protons and neutrons of an atom

eg :- c-a has mass number 40 as the sum of calcium is 40 (20+20)

(III) isotopes :-

the elements having same atomic number but different atomic mass.

eg :- there are 2 types of oxygen , one has atomic mass 16 and other has 18

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