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Ch. 12&13 Vocab.

Atom and Periodic Words

worddefinitions
atom the smallest particle into which an element can be divided and still retain all of that element.
electron the negatively charged particles found in all atoms.
protons the positively charged particles of the nucleus.
neutrons the particles of the nucleus that have no charge.
isotope atoms that have the same number of protons but a different number of neutrons.
element a pure substance that cannot be seperated or broken down into simpler substances by physical or chemical means.
compound a pure substance composed of two or more elements that are chemically combined.
mixture a combination of two or more substances that are chemically combined.
periodic having a regular, repeating pattern
Periodic Law a law that states the chemical and physical properties of elements are periodic functions of their atomic numbers.
atomic number the number of protons in the nucleus of an atom.
atomic mass the weighted average of the masses of all the naturally occuring isotopes of an element.
Valence Electrons the electrons in the outermost energy level of an atom.
Halogens elements found in group 17 of periodic table.
Noble gases stable, inert elements found in group 18 of periodic table.
Ernest Rutherford positive charged nucleus, atom mostly empty space electrons travel around nucleus.
Nils Bohr used the planetary model to describe the atom.
Democritus first to come up with the idea of an atom.
Dimitri Mendeleev Father of Periodic Table, arranged elements from atomic mass.
Groups Vertical columns on periodic table composed of similar elements with similar charges.
Created by: mpelesasa
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