explin with examplesi. atomic massii. mass numberiii. Isotopesiv. Isob

1.	explin with examplesi. atomic massii. mass numberiii. Isotopesiv. Isobars
Answer» (iii) Isotopes - Isotopes are atoms of the same element having the same atomic number but different mass numbers. For example -- All chlorine atoms contain 17 protons, so atomic no. Of all chlorine atoms is 17 . Now, some chlorine atoms have 18 neutrons whereas other chlorine atoms contain 20 neutrons. So, chlorine atom have mass numbers are 17+18=35 or 17+20=37 . Thus, chlorine has two isotopes i) Atomic number is the total number of protons present in the nucleus of an atom. It is also equal to the number of electrons for a neutral atom. Example, atomic number of sodium is 11.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. Example, hydrogen has 3 isotopes - protium (1H1), deuterium (2H1) and tritium (3H1).iv) Isobars are elements which have different atomic numbers but the same mass number. They are different chemical elements. Example, iron and nickel, both have mass number 58, whereas atomic numbers are different.\xa0 (ii) mass number - The total no. of protons and neutrons present in one atom of an element is known as mass number. For example - Sodium element contains 11 protons and 12 neutrons, so mass number of sodium is 11+12=23 .

explin with examplesi. atomic massii. mass numberiii. Isotopesiv. Isobars