a student wants to draw a model of an atom which statement describes how to find the number of neutrons to Include in the model would it be add the atomic number and the mass number or subtract the number of electrons the number of protons or subtract the atomic number from the mass number or the number of electrons the number of protons

Answer 1

To find the number of neutrons in an atom, the correct statement is to subtract the atomic number from the mass number.

Here’s how it works:

1. Atomic Number (Z): This is the number of protons in the nucleus of an atom. It also equals the number of electrons in a neutral atom.
2. Mass Number (A): This is the total number of protons and neutrons in the nucleus.

The formula to find the number of neutrons (N) is:

\[ \text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number} \]

So, if you have the mass number and the atomic number, you can easily find the number of neutrons by subtracting the atomic number from the mass number.