Which part of an atom has the smallest mass?

When two atoms of the same element have different masses, they are called ______, and have a different number of ______.

What charge does an atom have when it GAINS electrons?

What is the mass number of bromine?

How many electrons does this bromine atom have?

What two particles determine the mass number?

How many neutrons does this Neon atom have?

What is the atomic number of this element?

If an atom has 1 proton, 0 electron, and 1 neutron, it is:

How would you write the isotope name from this nuclide symbol?

What is the difference between the following atoms of iron: Fe⁵⁸ and Fe⁵⁶?

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?

I. $$\frac{75}{33}X$$   II) $$\frac{79}{34}X$$   III) $$\frac{81}{37}X$$   IV) $$\frac{81}{34}X$$