3. If there is an atomic mass of 47 and the atomic number is 20,
how
many protons and neutrons
are there?

20

27

Explanation:

Given parameters:

Atomic mass  = 47

Atomic number  = 20

Unknown:

Number of protons  = ?

Number of neutrons  = ?

Solution:

To solve this problem,

  Atomic mass  = number of protons + number of neutrons

    Atomic number  = number of protons

So;

   Number of protons  = 20

 Now;

    Number of neutrons  = Atomic mass  - number of protons

     Number of neutrons  = 47  - 20  = 27

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Explanation:

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