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Foreman/Kerley wk 5

Periodic Table Vocabulary

Periodic Table of Elements a table showing the chemical elements arranged according to their atomic numbers
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
atomic mass the average mass of protons and neutrons in an element
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, shiny, malleable, and good conductors
nonmetals elements that are typically not shiny, usually a gas or brittle solid, not malleable, and poor conductors
metalloids elements that have properties of both metals and non-metals and are sometimes referred to as semiconductors
noble gases unreactive non-metals in Group 18 of the Period Table
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 element will react.
atom the smallest unit of an 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
nucleus the tiny, very dense positively charged center of an atom
electron cloud the area outside the nucleus, where all the energy levels with all 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
Created by: foremanh71