First 9 Weeks Review

Term Definition
Elements are arranged by atomic number. There are 7 periods that are in rows on the periodic table.
There are 18 families that are in columns on the periodic table.
The families have common characteristics.
Family #1
Alkali Metals
Family #17
is reactive because they only need one electron in the outer shell to be complete.
The elements are less reactive as you move down the family.
Family #18
Nobel Gases
not reactive at all.
The outer shell or energy level is complete.
Metals Most of the elements on the periodic table are _______.
________ are good conductors of heat and electricity.
________ have luster.
________ are malleable and ductile.
Nonmetals have opposite properties of metals.
They are brittle.
They are good insulators.
Metalloids have properties of metals and nonmetals.
Ionic bond metal loses an electron to a nonmetal
Metallic bond atoms of metals pool their electrons with other metals
Covalent bond 2 metals share electrons
Acids can cause changes in metals.
#1- #6 on a pH scale.
Bases If something is too acidic and you want to bring it down to NEUTRAL, you would add this.
#8- #14 on a pH scale.
Neutral #7 on the pH scale
Elements on the periodic table join to form compounds.
A molecule formula that starts with an H (Hydrogen) is usually an acid.
(Examples: HCl, HBr, HI)
Base examples LiOH

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