Question

An element x has atomic number 19 and atomic mass 40 atomic mass unit.calculate it's number of neutron
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Answer 1

Answer:

Explanation:

mass no. = protons +neutrons

And

protons=electrons=atomic no.=19

Mass no.=40

40=19+neutrons

NeutRons=40-19=21

Neutrons are 21

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Answer 2

Answer:

At. No.=19(no. Of protons=no.of electrons)

At.mass.=40(no.of protons+no.of neutrons)

Thus,

40=no. of protons+no. of neutrons

40=19+no. of neutrons

No. Of neutrons=40-19

=21(answer)

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Explanation: