Unit 6 The periodic table

Alkali metal

Alkali metal - Group I elements

Alkaline earth metal

Alkaline earth metal - Group II elements

Anion

Anion - a negatively charged ion (negative ion)

Cation

Cation - a positively charged ion (positive ion)

Group

Group - the vertical columns in the periodic table

Halogen

Halogen - Group VII elements

Ion

Ion - formed when an atom either loses or gains one or more electrons and is either positively or negatively charged

Noble gas

Noble gas - a chemically inert gaseous element belonging to the same group (Group 0) as helium in the periodic table; noble gases in the air include argon, helium, neon, krypton and xenon

Octet rule

Octet rule - atoms become stable by having eight electrons in their outermost shells

Period

Period - the horizontal rows in the periodic table

Periodic table

Periodic table - a table in which all chemical elements are arranged in order of increasing atomic number

Reactivity

Reactivity - how readily an element reacts with another element

Salt

Salt - a compound formed between a metal and a non-metal

Transition metal

Transition metal - elements between Groups II and III of the periodic table

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