Question

An element has mass number 39 and atomic number 19. The number of protons and electrons in this element is

Answer 1

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Mass number = 39

Atomic number = 19

No of protons = 19

No of electrons = 19

No of neutrons = 39-19 = 20

Hope this helps u

Answer 2

Answer:

No. of Neutrons = Mass No. - Atomic No

= 39 - 19

=20