STAAR Vocabulary 5 Flashcards

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0
Q

Vertical columns on the periodic table with similar properties; also called families.

A

Groups

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1
Q

An arrangement of the elements according to their atomic number.

A

Periodic table

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2
Q

Each horizontal row of elements from left to right on the periodic table.

A

Periods

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3
Q

A substance that cannot be broken down chemically into simper substances.

A

Element

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4
Q

Electrons in the last shell or energy level of an atom.

A

Valence electrons

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