Classification of Matter

All elements are composed of extremely small particles called:

• compounds

• mixtures

• atoms

• molecules

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NGSS.MS-PS1-1

Which of these statements are false?

• Oxygen and copper are examples of elements.

• Elements are pure substances.

• Atoms of different elements can combine to form compounds.

• Atoms of different elements are the same.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which two particles are found in an atom's nucleus?

• protons & neutrons

• neutrons & electrons

• electrons & protons

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NGSS.MS-PS1-1

Which particles in atoms have a negative electric charge?

• electrons

• protons

• neutrons

• nuclei

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NGSS.MS-PS1-1

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

• nuclei

• electrons

• neutrons

• isotopes

What information in the periodic table indicates the number of protons in an atom?

• The position of the element in its column.

• The element's chemical symbol.

• The element's atomic number.

• The element's atomic mass.

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NGSS.MS-PS1-1

Which of the following statements about transition metals is true?

• They are never found uncombined in nature.

• They include familiar metals such as gold, silver, copper, and nickel.

• They are so soft that they can be cut with an ordinary knife.

• They are the most reactive of all the types of metals.

Which groups of elements share characteristics with both metals and nonmetals?

• salts

• metalloids

• halogens

• lanthanides

Which of the following terms means that metals can be rolled in thin sheets, as in aluminum foil or beaten into complex shapes?

• polar

• alloy

• ductile

• malleable

Most metals are not:

• ductile

• good conductors of heat and electricity

• liquid at room temperature

• malleable

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NGSS.MS-PS1-4