Question

Write down the symbols of first 20 elements of the periodic table metioning their atomin and mass number.

Answer 1

H - hydrogen
He- helium
Li- lithium
Be- berelium
B- boron
C- carbon
N- nitrogen
O- oxygen
Fl- fluorine
Ne- neon
Na- sodium
Mg- magnesium
Al- aluminum

Answer 2

HEY MATE
HERE IS YOUR ANSWER


NUMBER ELEMENT - ATOMIC NUMBER MASS NUMBER





1 HYDROGEN- 1 1
2 HELIUM-2 4
3 LITHIUM - 3 7
4 BERYLLIUM - 4 9
5 BORON - 5 11
6 CARBON - 6 12
7 NITROGEN - 7 14
8 OXYGEN - 8 16
9 FLUORINE - 9 19
10 NEON-10 20
11 SODIUM-11 23
12 MAGNESIUM - 12 24
13 ALUMINUM - 13 27
14 SILICON-14 28
15 PHOSPHORUS - 15 31
16 SULPHUR - 16 32
17 CHLORINE-17 35
18 ARGON-18 40
19 POTTASIUM - 19 39
20 CALCIUM - 20 40


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