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Atoms, Elements, and Compounds Questions and Answers
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Atoms, Elements, and Compounds
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Atoms, Elements, and CompoundsThe 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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