The atomic number of lithium is 3. How many neutrons does an atom of lithium have...

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Answer 1

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Answer #1

General atomic symbol is

Here A = atomic number = number of protons

Z = mass number = number of protons + number of neutrons

X is chemical symbol of an element

In an neutral atom no. of protons = no. of electrons

Given atomic number of Li = 3. so A = 3.

=

i.e. Mass number is = 7 = Z.

But Li atomic number = no.of protons = 3.

We know that Z = protons + neutrons

Then 7 = 3 + neutrons

Neutrons = 7-3 = 4.

No of protons = 3, number of neutrons = 4, no. of electrons = 3.

Answer 2

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