. An atom of phosphorous can be written as 15P31 , (i) What does the figure 31 indicates? (ii) What does the figure 15 indicates? (iii) What is the

Best Answer

(i)The figure 31 indicates the mass number of phosphorous.

(ii)The figure 15 indicates the atomic number of phosphorous.

(iii)The number of proton is equal to the atomic number, thus phosphorous has 15 protons.

(iv)In an atom, the number of proton is equal to the number of electrons, thus phosphorous has 15 electrons. 

(v)Mass number= number of protons + number of neutrons

31=15+ number of neutrons

Number of neutrons = 31-15=16


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