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Unit 1A

Atoms and Their Parts 8th Grade

one atom The smallest unit of an element that has all the properties of that element.
nucleus The tiny, very dense positively charged region in the center of an atom. It is made of protons and neutrons.
electron cloud All of the area inside an atom but outside the nucleus. It is where electrons are found.
electrical charge A form of charge, designated negative, positive, or neutral. It is found on the subatomic particles.
proton A positively charged subatomic particle of the nucleus of an atom. It contributes to the mass of the atom.
neutron A subatomic particle of the nucleus of an atom. It has no charge. It contributes to the mass of an atom.
electron A negatively charged subatomic particle of the electron cloud. It forms chemical bonds with other atoms.
subatomic particles Particles that are smaller than the atom.
atomic mass The mass of an atom, approximately equal to the number of protons and neutrons in the atom. Always round this number.
scientific notation Numbers written in terms of a decimal number between one (1.0) and ten (10.0) multiplied by a power of ten. Used for very large and very small numbers.
atom Smallest unit of an element, made of protons, electrons, and neutrons.
cell Smallest unit of life; still much larger than an atom.
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