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Atoms, Elements, and Compounds Questions and Answers

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Atoms, Elements, and Compounds

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  • October 25, 2024
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  • 2024/2025
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Atoms, Elements, and Compounds

The building block of matter. It is the smallest unit of a pure substance that still has the
properties of the substance. - answer atom

The center of an atom; contains neutrons and protons. - answer nucleus

The positively charged particles in an atom's nucleus. - answer proton

A particle without a charge in an atom's nucleus. – answer neutron

A negatively charged particle that occupies space around an atom's nucleus. - answer
electron

A pure substance composed of only one type of atom; cannot be broken down into
another substance by physical or chemical means. - answer element

Atoms that have the same number of protons but a different number of neutrons. -
answer isotope

A pure substance with unique properties; formed when two or more different elements
combine. - answer compound

Two or more atoms that are held together by bonds. - answer molecule

An atom that is negatively or positively charged because it has lost or gained one or
more electrons. - answer ion

The number of protons in the nucleus of an atom. - answer atomic number

What scientists measure the mass of an atom in. - answer atomic mass units or amu

The average number of protons and neutrons in all of the isotopes of a substance. -
answer atomic mass

An element that conducts heat and electricity well and are malleable. Most are solid at
room temperature. - answer metal

The only metal that is not solid at room temperature. - answer Mercury

What percentage of elements are metal? - answer75 percent

The ability to be bent and rolled into sheets. - answer malleability

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