Mass number is the number of
The charge on an ion can be calculated as
The atomic number identifies the element. The atomic number is the number of ____ in the nucleus of its atoms.
Isotopes of an element have the same number of __ but a different number of __.
It has 20 protons and 18 electrons. The element is ___ and it has a charge of ___. (hint: use your periodic table)
A sodium atom has a mass number of 24. How many neutrons does it have? (Hint: figure out the number of protons using the periodic table)
An atom has 27 protons and 35 neutrons. Its mass number is
For an atom to be neutral it must have
Compared to the Carbon-12 isotope, the Carbon-14 isotope has
The charge and location of neutrons in an atom are, respectively,
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