Question

Which of the first 20 elements in the Periodic Table has atoms with the
greatest mass?​

Answer 1

Answer:

Calcium

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Answer 2

Answer:

mass is calculated in AMU(atomic mass unit)

in first 20 elements calcium has highest mass =40.078 AMU

Explanation:

H - Hydrogen - 1.0079 u

He - Helium - 4.0026 u

Li - Lithium - 6.941 u

Be - Beryllium - 9.0122 u

B - Boron - 10.811 u

C - Carbon - 12.0107 u

N - Nitrogen - 14.0067 u

O - Oxygen - 15.9994 u

F - Fluorine - 18.9984 u

Ne - Neon - 20.1797 u

Na - Sodium - 22.9897 u

Mg - Magnesium - 24.305 u

Al - Aluminum - 26.9815 u

Si - Silicon - 28.0855 u

P - Phosphorus - 30.9738 u

S - Sulfur - 32.065 u

Cl - Chlorine - 35.453 u

Ar - Argon - 39.0983 u

K - Potassium - 39.498 u

Ca - Calcium - 40.078 u

These are the approximate values of atomic masses of first 20 elements in the periodic table.