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Chemistry/ CH. 4

Atoms

WordDefinition
Atom The smallest particle of an element that retains its identity in a chemical reaction.
Atomic Mass The weighted average mass of the atoms in a natural occurring sample of an element.
Atomic Mass Unit (AMU) One twelve of a carbon-12 atom.
Atomic Number The number of protons in the nucleus of an atom of that element.
Cathode Ray A glowing beam that traveled from the Cathode disk to the Anode disk.
Electrons Negatively charged subatomic particles.
Group The vertical columns of the periodic table.
Isotopes Atoms that have the same number of protons but different number of neutrons.
Mass Number The total number of protons and neutrons in an atom.
Neutron Subatomic particles with no charge but with a mass nearly equal of that of a proton.
Nucleus The tiny central core of an atom and is composed of protons and neutrons.
Period The horizantal rows of the periodic table.
Periodic Table An arrangement of elements in which the elements are seperated into groups based on a set of repeating properties.
Proton Positively charged subatomic particals.
Daltons Atomic Theory 1 1. All elements are composed of tiny invisible particles called atoms.
Daltons Atomic Theory 2 2. Atoms of the same element are identicle. The atoms of any one element are different from those of any other element.
Daltons Atomic Theory 3 3. Atoms of different elements can phisically mix together or can chemically combine in simple whole-number ratios to form compounds.
Daltons Atomic Theory 4 4. Chemical reactions occur when atoms are seperated, joined, or rearranged. Atoms of one element, however never changed into atoms of another element as a result of chemical reaction.
Created by: Kako