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Question - Mass Number

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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 ElementSymbolAtomic NumberNumber of protonsNumber of NeutronsNumber of ElectronsDistribution of ElectronsValency
KLMN
HydrogenH11-11---1
HeliumHe22222---0
LithiumLi334321--1
BerylliumBe445422--2
BoronB556523--3
CarbonC666624--4
NitrogenN777725--3
OxygenO888826--2
FluorineF9910927--1
NeonNe1010101028--0
SodiumNa11111211281-1
MagnesiumMg12121212282-2
AluminiumAl13131413283-3
SiliconSi14141414284-4
PhosphorusP15151615285-3.5
SulphurS16161616286-2
ChlorineCl17171817287-1
ArgonAr18182218288 0

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