Question

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Answer 1

Answer:

mass no. of flourine 18.998403u

no. of protons are 9 and no. of electrons are 9 atomof species is flourine

2.no. of electrons ,protons and neutrons are 16

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Answer 2

Answer:

1. 19,9,9,Fluorine

2. 16, 16 ,16

3.12,12,12,Magnesium

4.

5. 1,Hydrogen