It is and what its mass number will be
2 The mass number of a neutral atom Y is 39 and the number of electrons present in it is 19. Find
out the number of protons and the number of neutrons present in it.
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Mass no of Y =39
No.of electrons=19
No. Of protons =no. Of electron
So, no. Of protons =19
No.of protons +no. Of neutrons =mass no.
19 +no. Of neutrons =39
No.of neutrons =39 - 19
No. Of neutrons =10
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