Question

state the number of protons neutron and electrons in the atom given below 137Ba56​

Answer 1

Given :

$\sf \: {}^{137} Ba_{56}$

To find :

• No.of protons
• No.of neutrons
• No.of electrons

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S o L u T i o N : ㅤㅤㅤㅤ

⠀⠀As we know that,

$\sf \: {}^{A} X_{Z} \:$

X → Element

A → Mass number

Z → Atomic number

By comparing with this

Atomic number of element is : 56

Mass number of element is : 137

$\: \boxed{ \underline{ \mathfrak{atomic \: number = \: no .\: of \: protons = no. \: of \: electrons}}}$

So,

No.of protons : 56

No.of electrons: 56

Now,

$\: \boxed{ \underline{ \mathfrak{neutrons = (mass \: number \: ) - (atomic \: number)}}}$

$\mathfrak{ = \: 137 - 56}$

$\mathfrak{ = \: 81}$

No.of neutrons = 81