Atoms
The smallest unit of a puresubstance that still has theproperties of the substance
atom
Pure substance that is made up of only one kind of atom
element
Table of elements organized by their atomic number
Periodic Table
Units of two or more atoms
Molecule
Substance formed from the atoms of two or more elements
compound
Substance with a pH of 7
neutral
The center of any atom
nucleus
An element that conducts heat and electricity well
metal
Rows that have similar arrangements of electrons
periods
State of matter that has a definite shape and a definite volume
solid
Chemical symbols and the number of atoms make up the ________________
chemical formula
Number of protons in an element
atomic number
A subatomic particle with a positive charge
Proton
can be bent or rolled
malleable
Columns that have similar properties
families or groups
State of matter that Does not have a definite shape and has a definite volume
liquid
What tells whether a substance is an acid, base, or neutral
Indicator
Who shot charged particles at a sheet of gold (plum pudding model) and discovered that atoms are mainly empty space with a tiny, dense, positively charged nucleus at the center
Ernest Rutherford
A subatomic particle with a negative charge
electron
Elements that do not have characteristics of metals
nonmetals
What separates the metals from the nonmetals
A zigzag line
State that has a indefinite shape and indefinite volume
gas
Substance with a pH of 7-14
base
Bitter tasting
Items like laundry detergent, soap, cleaning supplies
base
A subatomic particle with a neutral charge
nuetron
List some qualities of metals
shiny
silver/gray
conductors
malleable
First person to organize the elements by properties
Mendeleev
Gas that has free electrons and positive ions (charged gas)
plasma
Substance with a pH of 0-7
acid
Sour tasting
Includes items like lemon juice, vinegar, sodas
acids