Unit II Vocabulary | Vocab Set #1 | Vocab Set #2 | Vocab Set #3 | Vocab Set #4

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Unit II, Vocab #3 | Table Template

Atomic Mass: average mass of an atom of an element; its unit of measure is the atomic mass unit (u), which is 1/12 the mass of a carbon-12 atom.

Atomic Number: number of protons in the nucleus f each atom of a given element; is the top number in the periodic table.

Compound:  a substance produced when elements combine and whose properties are different.

Electron:  negatively-charged particle that exists in an electron cloud formation around an atom’s nucleus.

Electron Cloud: region surrounding the nucleus of an atom, where electrons are most likely to be found.

Element: substance that cannot be broken down into simpler substances.

Isotopes:  two or more atoms of the same element that have different numbers of neutrons in their nuclei.

Mass Number: sum of the number of protons and neutrons in the nucleus of an atom.

Metal:  element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster.

Metalloid: element that shares some properties with both metals and nonmetals.

Mixture: a combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixture’s identity.

Neutron:  electrically-neutral particle that has the same mass as a proton and is found in a atom’s nucleus.

Proton: positively-charged particle in the nucleus of an atom.

Nonmetal:  element that is usually a gas or brittle solid at room temperature and is a poor conductor of heat and electricity.