By: Romyrl Mestiola

- Positive charged sub-atomic particles that can be found inside the nucleus and weighs 1 amu.

-Negative charged sub-atomic particles that are found outside the nucleus.

- Sub-atomic particles that are neutral in charge and weighs 1 amu.

-Elements in group 1A of the periodic table of elements.

-Elements in group 2A of the periodic table of elements.

-Elements in group 7A of the periodic table of elements.

-Elements in group 8A of the periodic table of elements.

-The number of protons and electrons of an element.

-The sum of the number of neutrons and protons in an atomic nucleus.