Question

Atomic mass and atomic number of first 30 elements flashcard

Answer 1

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ATOMIC NUMBER 1 TO 10
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Hydrogen Helium Lithium Barelium Boron Carbom Nitrogen Oxygen Florine Neon

ATOMIC NUMBER 11 to 20
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulphur
clorine
Argon
potassium
calcium

for mass mul. the atomic no by 2 for even no and ×2+1 for odd no