Question

( 50 points question )
why the atomic mass of Phosphorus is 30 not 31, for finding mass number we have to do atomic number + neutron but when I do 15+16 it has to be 31 but in book or anywhere in internet there is 30 mass number of phosphorus, I have this same problem with others elements, plz give answer fast, I will give you 50 points ​

Answer 1

Answer:

A pH of 7 indicates a neutral soil. The pH is important because it influences the availability of essential nutrients. Most horticultural crops will grow satisfactorily in soils having a pH between 6 (slightly acid) and 7.5 (slightly alkaline).

Answer 2

Answer:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.