Atoms and Matter

Question Answer
Protons and neutrons are in the _______ of the atom. nucleus
Anything that has mass and takes up space. matter
A mixture in which two or more substances are evenly mixed but not bonded together. homogeneous mixture
A mixture in which the substances are not evenly mixed. heterogeneous mixture
Two or more atoms that are held together by chemical bonds and act as a unit. molecule
Matter with a composition that is always the same. substance
Substance made of only one kind of atom. element
A small particle that is the building block of matter. atom
Substance made of two or more elements that are chemically joined in a specific combination. compound
Granite HE
Smoke HE
Soda HO
Brass HO
Trail mix HE
Air HO
Tap water HO
Positively charged particle in the nucleus of an atom. proton
Region surrounding an atom's nucleus where one or more electrons are often found. electron cloud
Negatively charged particle that occupies the space in an atom outside the nucleus. electron
One or more atoms of an element having the same number of protons but a different number of neutrons. isotope
Region at the center of an atom that contains most of the mass of an atom. nucleus
An atom that has a charge because it has gained or lost electrons. ion
The number of protons in the nucleus of an atom of an element. atomic number
Uncharged particle in the nucleus of an atom. neutron
Which particle in an atom has a positive charge? proton
Which particle in an atom has no charge? neutron
Which particle in an atom has a negative charge? electron
Where is the most of the mass of an atom found? nucleus

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