Dear Readers, Welcome to Awareness Adda. we are here for helping you to get a good score on your examinations like SBI, IBPS, RRB, and SSC etc. so we are providing some important materials. in the previous article, we discussed the introduction to chemistry and Physical Chemistry. in today article we learn about Atomic Mass Unit and Mole Concept. 

Atomic mass unit and mole concept:

            Atomic mass of unit (a.m.u)  the 1/12th part of the mass of a carbon atom is called atomic mass unit.

            Atomic mass or mass number: the atomic mass or mass number of an element is a number which tells us that the mass of an atom of the element is how many times heavier than the mass of the 1/12th part of a carbon ().

            Here are Some elements and their respective atomic number and atomic mass.

ELEMENT SYMBOL ATOMIC NUMBER ATOMIC MASS
Hydrogen

Helium

Lithium

Boron

Carbon

Nitrogen

Oxygen

Sodium

Magnesium

Aluminum

Sulphur

potassium

calcium

iron

silver

gold

lead

Zinc

H

He

Li

B

C

N

O

Na

Mg

Al

S

K

Ca

Fe

Ag

Au

Pb

Zn

1

2

3

5

6

7

8

11

12

13

16

19

20

26

47

79

82

50

1.005

4.003

6.940

10.82

12.011

14.006

15.999

22.989

24.32

26.97

32.064

39.09

40.08

55.847

107.880

196.9665

207.21

65.38

            If in a substance there are 6.023x atoms, molecules or ions then the substance is said to have the 1-mole amount. Thus a definite number (6.023x) of atoms, molecules or ions of any substance represent one mole and this number is called Avogadro number. Thus in any element, the number of atoms present in 1g atom or 1mole is 6.023x and it is called Avogadro number.

            In next article, we will provide notes about atomic structure. so keep in touch with us in Awareness Adda. these topics are very useful to you for getting a good score in your examinations and always remember that “Some fish love to swim upstream. Some people love to overcome challenges”. so prepare well All The Best. Thank you.