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explin with examples i. atomic mass ii. mass number iii. Isotopes iv. Isobars

Posted by Arpit Singh 5 years, 9 months ago

CBSE > Class 09 > Science

3 answers

Rakhi Vasodiya11 5 years, 9 months ago

(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

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Yogita Ingle 5 years, 9 months ago

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.

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Rakhi Vasodiya11 5 years, 9 months ago

(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 .

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