Most nonmetals are

Atoms that gain or lose electrons are called

Elements that belong to the same group have the same number of

As you move from up to down in a column of the periodic table, elements have

Mendeleev left gaps in his periodic table because

When did Mendeleev create a new row in his periodic table?

As you move from left to right across the periodic table, elements

In Mendeleev’s periodic table, elements in each column had similar

Semiconductors are elements that

Which statement about the alkali metals is correct?

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