Question

define
1 atomic no
2 mass no.
3 Isotopes
4 Isobars

Answer 1

Answer:-

(i) Atomic Number : The number of protons present in the nucleus of an atom is called atomic number. It is denoted by Z. e.g: i.e., atomic number = 20

(ii) Mass Number: The sum of the number of protons and neutrons present in the nucleus of an atom is called mass number. It is denoted by A. e.g.   i.e., mass number = 40



(iii) Isotopes : The atoms of the same elements having same atomic number but different mass numbers are called isotopes, e.g. and

(iv) Isobars : The atoms having same mass number but different atomic number are called
isobars, e.g.: and  

(v) Uses of isotopes : (i) As nuclear fuel: An isotope of uranium (U – 235) is used as a nuclear fuel.
(ii) In medical field : An isotope of cobalt is used in the treatment of cancer.

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Answer 2

atomic no.- The no. of protons in the nucleus of an atom, which is a characteristic of a chemical element and determine its place in the periodic table.

mass no.-The total no. of protons and neutrons in a nucleus

Isotopes- each or two or more forms of the same element that contain equal no. of protons but different no. of electrons in their nuclei, and hence differ in relative atomic mass but not in a chemical properties, in particular, a radioactive form of an element.

isobars- each of two or more isotopes of different elements, with the same atomic weight.

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