Definition 1
Definitions 2
On the Periodic Table
Counting Atoms
Elements Compounds and Mixtures
Elements
100
Shiny, malleable, ductile, conductive of both heat and electricity
Example: Iron, copper, and Sodium
What is a Metal
100
A pure substance composed of all the same kind of atom
What is an element?
100
Vertical columns on the periodic table are called?
What are families?
100
3H2SO4 How many molecules?
3
100
Element
100
Symbol for Lead
Pb
200
Dull, brittle, not a conductor of heat or electricity.
Example: Carbon, Sulfur, and Hydrogen
What is a Nonmetal
200
Two or more elements chemically bonded together that cannot be separated by physical means
What is a compound
200
Members of a group on the periodic table have this in common.
Similar physical properties, Same number of valence electrons, similar ways of bonding to form compounds.
200
3H2SO4 How many Sulfur atoms?
3
200
Element (diatomic)
200
Symbol: Fr
Francium
300
Displays some characteristics of both metals and nonmetals, called Semiconductors
Example: Boron, Silicon, Germanium
What is a metalloid?
300
Any combination of elements or compounds or both that exist together without being chemically bonded
What is a mixture?
300
Group 18
Noble Gasses
300
Ca(C2H3O2)2 How many Oxygen atoms?
4
300
Compound
300
Element found in period 5 with 3 valence electrons
Indium
400
A letter or letters used in a compound formula to indicate which elements are present in the compound
What is an elemental symbol?
400
Two atoms of the same kind that occur bonded together in nature
What is a diatomic elemental molecule?
400
Group 1
Alkali metals
400
5Ga2(Cr2O7)3 How many Chromium atoms?
30
400
Mixture of elements
400
alkali metal in period 2
Lithium
500
A number to the lower right of an elemental symbol that tells you how many atoms of that element are in a compound
What is a Subscript?
500
The substance that is dissolved when a solution is formed
What is a Solute?
500
Group 2
Alkaline Earth Metals
500
4Fe2O3 Total number of atoms?
20
500
Mixture of elements
500
group 8; period 4
Iron
600
Number to the left of a compound formula that tells you how many molecules you have of that compound.
What is a coefficient?
600
In a solution, the substance in which another substance is dissolved
What is a solvent?
600
Elements found around the red line on the periodic table.
Metalloids
600
7C2S2 What does C and S represent?
Elements, Carbon/Sulfur
600
Mixture of elements and compounds
600
Symbol for Titanium
Ti
700
Drawings or illustrations used to represent ideas or concepts
What is a visual model?
700
A mixture that appears uniform (same) throughout, a solution
What is homogeneous?
700
Most reactive metal
Francium
700
3NaHCO3 How many elements are present?
4
700
Element
700
U
Uranium
800
Tangible objects used to represent a scientific phenomenon, such as nuts, bolts, and washers to represent atoms
What is a physical model?
800
Describes a mixture in which the component parts are visible
What is heterogeneous?
800
Most reactive Nonmetal
Fluorine
800
5Al2(SiO3)2 Total number of atoms?
50
800
Mixture of compounds
800
Ar
Argon