In an atom, the number of protons equals the number of

Which describe the characteristics of metals?

Columns (groups) of the periodic table

The elements that do not ordinarily form compounds are called

Atoms with the same number of protons but a different number of neutrons are called

Which group of elements have properties of metals and nonmetals?

The model that shows electrons orbiting the nucleus similar to the way planets orbit the sun is called

Mendeleev arranged his periodic table by

Horizontal rows are the periodic table are known as

The number of neutrons in an atom can be determined by

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