The first 20element in modern periodic table with there atomic mass and atomic number
Answers
first 20 elements in modern periodic table are -
1) hydrogen (H ) atomic NO. 1 , MASS - 1.01
2) HELIUM ( He) atomic no. 2 , MASS - 4.00
3) Lithium ( Li) atomic no. 3 , MASS - 6.941
4) beryllium ( Br ) atomic no.4 , MASS - 9.0122
5) boron (B ) atomic no.5 , MASS - 10.811
6) carbon ( C ) atomic no.6 , MASS - 12.0101
7) nitrogen (N)atomic on. 7 , MASS - 14.0067
8) oxygen ( O ) atomic no.8 , MASS - 15.9994
9) fluorine (F) atomic no. 9 , MASS - 18.9984
10) neon ( Ne) atomic no. 10 , MASS - 20.1797
11) sodium ( Na ) atomic no. 11 , MASS - 22.9897
12) magnesium (Mg) atomic no. 12 , MASS - 24.305
13) aluminium (Al) atomic no.13 , MASS - 26.9815
14) silicon (Si) atomic no. 14 , MASS - 28.0855
15) phosphorus (P) atomic no.15 , MASS - 30.9738
16) sulphur ( S) atomic no. 16 , MASS - 32.065
17) chlorine (Cl) atomic no. 17 , MASS - 35.453
18) argon (Ar) atomic no. 18 , MASS - 39.948
19) potassium (K) atomic no. 19 , MASS - 39.0983
20)calcium (Ca) atomic no. 20 , MASS - 40.078
IF THERE ARE ANY MISTAKES I AM SORRY FOR THAT PLEASE RE CHECK IT ON GOOGLE. I HOPE IT HELPED YOU DEAR, AND BTW IT HELPED ME TOO AS I NEVER STUDIED THE ATOMIC MASSES AND ATOMIC NUMBERS. ANYWAYS , PLEASE GIVE IT A BRAINLY MARK
THANK YOU.......
In Modern Periodic table, elements ar placed in increasing order of teir atomic number .
The first 20 elements with their atomic number and Atomic mass :
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Atomic number Element Atomic mass
with symbol (expressed in u]
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1. Hydrogen - H 1
2 Helium - He 4
3 Lithium - Li 7
4 Beryllium - Be 9
5 Boron - B 11
6 Carbon -C 12
7 Nitrogen - N 14
8 Oxygen - O 16
9 Fluorine - F 19
10 Neon - Ne 20
11. Sodium - Na 23
12 Magnesium - Mg 24
13 Aluminum - Al 27
14 Silicon - Si 28
15 Phosphorous - P 31
16 Sulphur - S 23
17 Chlorine - Cl 35.5
18 Argon- Ar 40
19 Potassium - K 39
20 Calcium - Ca 40
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