Question

An Atom has an atomic number of 19 and a mass number of 39 how many electrons proton and neutrons does it have? ​

Answer 1

Explanation:

Atomic no.=no. of protons=no. of electons

thus no. of proton = no. of electons=19

no of neutrons=mass no. - atomic no.

neutrons=39-19

no. of neutrons=20

Answer 2

Explanation:

there are 19 number of electron and protons as atomic mumber = no. of proton = no.of electron.

atomic mass = no.of protons + no.of neutron

39= 19+ n

n= 20

therefore no.of electron = no.of proton = 19

no.of neutrons = 20

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