Which of the following is the best description of the model of the atom.

What particles make up the atomic nucleus?

Which statement about the relative number of subatomic particles in an atom is always true?

In which part of an atom is most of the mass located?

What is the mass number of an atom with 6 protons and 7 neutrons.

Which of the following symbols represents the element with an atomic number of 14?

How many electrons does an atom have if the mass number is 15 and the number of neutrons is 7?

Which statement about elements and their relationship in the periodic table is true?

Who discovered that neutrons were part of the atom?

Who discovered that electrons were part of the atom?

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