Question

Q1. Write atomic mass of elements 1-20.

Q2. Define atomic mass ?


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Answer 1

Explanation:

Hydrogen

1 H 1

Helium

4 He 2

Lithium

7 Li 3

Beryllium

9 Be 4

Boron

11 B 5

Carbon

12 C 6

Nitrogen

14 N 7

Oxygen

16 O 8

Fluorine

19 F 9

Neon

20 Ne 10

Sodium

23 Na 11

Magnesium

24 Mg 12

Aluminium

27 Al 13

Silicon

28 Si 14

Phosphorus

31 P 15

Sulphur

32 S 16

Chlorine

35.5 Cl

Argon

40 Ar 18

Potassium

39 K 19

Calcium

40 Ca 20

the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

Answer 2

Answer:

Q.2 Carbon 12 atom is that atom of carbon which has 6 protons and 6 neutrons in it's nucleus so that it's mass number is 12.

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