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S-36 S-34 P-35 P-32 P-31 P-33
Arrange the isotopes of sulfur and phosphorus in order of decreasing number of neutrons.

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Isotopes of the same element is characterized by having the same number of protons. For phosphorus, it has 15 protons and , for sulfur, it has 16 protons. So, we can calculate the number of neutrons by subtracting the number above of every isotope with the number of protons.

P-31 S-34 P-32  P-33 S-36 P-35   

Answer: Decreasing order for number of neutrons: P-35 > S-34= P-33 >S-32= P-31

Explanation:

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

Atomic number is defined as the number of protons or number of electrons that are present in an atom.

Atomic number = Number of electrons = Number of protons

Phosphorous has atomic number of 15 and thus contains 15 protons and sulphur has atomic number of 16 and thus contains 16 protons.

1. For S-32

Mass number = 32

Atomic number = 16

Number of neutrons = Mass number - Number of protons= 32-16 = 16

2.  For S-34

Mass number = 34

Atomic number = 16

Number of neutrons = Mass number - Number of protons= 34-16 = 18

3. For P-35

Mass number = 35 , Atomic number = 15

Number of neutrons = Mass number - Number of protons= 35-15 = 20

4. For P-31

Mass number = 31

Atomic number = 15

Number of neutrons = Mass number - Number of protons= 31-15 = 16

5. For P-33

Mass number = 33

Atomic number = 15

Number of neutrons = Mass number - Number of protons= 33-15 =18

Decreasing order for number of neutrons: P-35 > S-34= P-33 >S-32= P-31

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