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An ion M 3- contain 10 …

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An ion M 3- contain 10 electrons and 7 neutrons . What is the atmoic number and mass numberof the element M? Name of the elment.

Posted by M M 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 3 months ago

M3- that means it has gain 3 electrons

Now M3- have 10 electrons

So M have 10 - 3=7 electrons

Atomic no = no of protons = original no of electrons

So atomic no is 7 which is nitrogen

Atomic mass = no of ( protons + neutrons)

7+7 =14u

Therefore.....

Atomic no. = 7

Atomic mass = 14u

Element = Nitrogen

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