elements are organized according to their properties, and also separated into GroUPs based on chemical reactivity

the number of protons in the nucleus of an atom, used to determine that element's position in the Periodic Table

(given or calculated); total number of Protons plus Neutrons found in the nucleus of an atom; on the Periodic Table it is a decimal number

vertical (up and down)columns on the Periodic Table; all elements in the column have same number of vAlence electrons - same chemical reActivity

Electrons located on the outer Energy Level, (shell, orbit); determines an element’s chemical reActivity

how one element reacts with another element, results from an incomplete outer Energy Level, (shell, orbit)

formal name for the elements in GroUP 18 (8A)

rule that explains that the outer Energy Level (shell/orbit) is complete when it has 8 vAlence Electrons

an element that no longer has the ability to chemically reAct

horizontal (side to side) rows on the Periodic Table; Pattern: Energy Levels increase from top to bottom (Period 2 has 2 Energy Levels, Period 5 has 5 Energy Levels)

negatively charged space around the Nucleus ; contains Electrons

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