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ForHed wk 5

Periodic Table Vocabulary 8th Grade

Periodic Table of Elements a table showing the chemical elements arranged in order of increasing atomic number
element a pure substance that cannot be separated into simpler substances by physical or chemical means
chemical symbol a one- or two-letter notation used to represent an atom of a particular element
atomic number the number of protons in the nucleus of one atom of an element; identifies the atom
atomic mass the average mass of protons and neutrons in an element; always round this number
groups The vertical columns on a Periodic Table -- They arrange the elements by the number of electrons in the outermost shell.
periods The horizontal rows in a Periodic Table -- They classify the elements by the number of electron shells.
metals elements that are typically solid, lustrous, malleable, and good conductors
nonmetals elements that are typically not lustrous, usually a gas or brittle solid, not malleable, and poor conductors
metalloids elements that have properties of both metals and non-metals and are found on the "steps" of the PTE
noble gases unreactive nonmetals in Group 18 of the Period Table; they won't even burn
electron shell a specific area where electrons of the same energy level are found
valence electrons the electrons in the outermost energy level -- They influence how an atom will react with other atoms
atom the smallest unit of an element, with all the properties of the element
proton a positively charged subatomic particle of the nucleus of an atom
protons and neutrons the two subatomic particles that contribute to the mass of an atom
neutrons a subatomic particle of the nucleus that has no electrical charge
reactivity rate at which a chemical substance tends to react
electrons the subatomic particle that affects the reactivity of an element
net charge the sum of the positive and negative charges in an atom
ion an atom that has gained or lost an electron and now has a net charge, either positive or negative
nucleus the very dense positively charged center of an atom
electron cloud the area outside the nucleus, where the energy levels (shells) with the electrons are found
subatomic particles particles that are smaller than (and inside) the atom
vertical standing upright
horizontal parallel to the horizon (line between sky and sea); flat
highly reactive describes an element that reacts quickly and/or easily with other atoms
less reactive/more stable describes an element that reacts slowly with other atoms
stable describes an element that does not react with other elements
Created by: foremanh71