2.

Chemistry

1 answer:

padilas [110]2 years ago

4 0

The element is P (Phosphorus) and the atomic number is just the number of protons so for A it would be 15.

For B to find the atomic mass you would just have to add the protons and neutrons so 15+16=31 and as we can see Phosphorus does have a mass of 31 so for B it would be 31

For C it would be 5
And for D it would be the atomic mass of Phosphorus which is 31 over the atomic number which is 15 so it would be P31/15

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