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# With the Help of Given Table 4.1, Find Out the Mass Number of Sulphur Atom. - CBSE Class 9 - Science

#### Question

With the help of given Table 4.1, find out the mass number of sulphur atom.

Table 4.1: Composition of Atoms of the First Eighteen Elements with Electron Distribution in Various Shells

 Name of Element Symbol Atomic Number Number of protons Number of Neutrons Number of Electrons Distribution of Electrons Valency K L M N Hydrogen H 1 1 - 1 1 - - - 1 Helium He 2 2 2 2 2 - - - 0 Lithium Li 3 3 4 3 2 1 - - 1 Beryllium Be 4 4 5 4 2 2 - - 2 Boron B 5 5 6 5 2 3 - - 3 Carbon C 6 6 6 6 2 4 - - 4 Nitrogen N 7 7 7 7 2 5 - - 3 Oxygen O 8 8 8 8 2 6 - - 2 Fluorine F 9 9 10 9 2 7 - - 1 Neon Ne 10 10 10 10 2 8 - - 0 Sodium Na 11 11 12 11 2 8 1 - 1 Magnesium Mg 12 12 12 12 2 8 2 - 2 Aluminium Al 13 13 14 13 2 8 3 - 3 Silicon Si 14 14 14 14 2 8 4 - 4 Phosphorus P 15 15 16 15 2 8 5 - 3.5 Sulphur S 16 16 16 16 2 8 6 - 2 Chlorine Cl 17 17 18 17 2 8 7 - 1 Argon Ar 18 18 22 18 2 8 8 0

#### Solution

Mass number of sulphur = Number of protons + Number of neutrons

= 16 +16

= 32

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Solution With the Help of Given Table 4.1, Find Out the Mass Number of Sulphur Atom. Concept: Mass Number.
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