Question

the mass no of an element is 14.it contains 7 electrons .how many no of protons and neutrons in it? what is its atomic number

Answer 1

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$mass \: no \: = \: neutrons \: + electrons \\ \\ 14 = 7 + neutrons \\ \\ therefore \: \\ neutrons \: = 7 \\ \\ \\ no \: of \: electrons = no \: of \: protons \\ \\ therefore \\ no \: of \: protons = 7$

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Answer 2

Answer:

Atomic no:7

Explanation:

Mass no-No.of electrons=Atomic no.

    14    -      7                           =7