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Solution - Mass Number

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Explain Mass number with examples.

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

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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Composition of the nuclei of two atomic species X and Y are given as under


XY
Protons66
Neutrons68

Give the mass numbers of X and Y. What is the relation between the two species?

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Complete the following table.

Atomic numberMass numberNumber of NeutronsNumber of protonsNumber of electronsName of the Atomic species
9-10---
1632---Sulphur
-24-12--
-2-1--
-1010-
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