Where the nucleus of an atom is located.
What is the center of the atom?
The periodic table is organized by this aspect of an atom.
What is the atomic number of an atom?
Two or more atoms chemically combined. May be the same.
What is a molecule?
Two or more atoms of different elements chemically combined.
What is a compound?
The region surrounding the nucleus of an atom. It is actually mostly space.
What is the electron cloud?
The positively charged subatomic particle found in the center of the atom.
What is a proton?
What rows are called.
What is a period?
How you determine the number of elements in a formula.
What is count all the capital letters?
This number tells you how many atoms of an element are found in the formula.
What is a subscript?
The element that is brittle and does not conduct electricity is letter _____. 
What is letter A?
The subatomic particle which does not have any charge at all.
What is a neutron?
What columns are called.
What are families or groups?
A symbolic representation of a chemical reaction, like the process of photosynthesis, for example.
What is a chemical equation?
In a chemical equation, these are the materials that we start with.
What are reactants?
Rust on a bicycle is an example of this type of change.
What is a chemical change?
The mass of each of the subatomic particles found in the nucleus.
What is 1 atomic mass unit, or AMU?
The sum of protons plus neutrons
What is the atomic mass number (accept mass)
This number tells you how many molecules (or sometimes atoms) of a formula are in the equation.
What is a coefficient?
The chemicals that result from a chemical reaction.
What are products?
Element letters C and D have luster and conduct electricity. They are ____________. 
What are metals?
The subatomic particle that is 1/2000 the size of the other subatomic particles.
What is the electron?
Elements in a period all share this same aspect of atomic structure.
What is the number of electron shells?
The large-sized number found in front of the N.
What is the coefficient?
The small number found behind and below the element symbols.
What is a subscript?
Argon (Ar) and Magnesium (Mg) have the same number of ___________.
What are electron shells?
positive, negative and neutral
What are the charges on the subatomic particles?
Elements in a family/group all share the same number of these.
When the number of atoms of all elements going into a rxn are the exact same as the number of atoms of those elements coming out.
What is balanced?
What goes in must come out (the same number of atoms).
What is the Law of Conservation of Mass?
Neon (Ne) and Krypton (Kr) have the same number of _______________.
What are valence electrons?
What is the valence shell?
All elements in a column share this same characteristic.
What is reactivity?
The total number of oxygen atoms in the reactants.
What is 6?
The total number of atoms in the reactants. 
What is 13?
The most reactive element in the table is letter ____.
What is letter C?
Determines the reactivity of an element.
What is a valence electron?
All elements in a row have this property in common.
What is nothing?
This is how to determine whether a chemical equation is balanced or not.
What is counting the number of atoms of each element on each side?
This equation is ______________. 
What is unbalanced?
Element C is in the ______ period and the ______ group.

What is the 4th period and 1st group?
Subatomic particle that determines the identity of an atom.
All element symbols start with this.
What is a capital letter?
The five signs of a chemical reaction.
What are GETPC (gas emitted, energy released, temperature change (unexpected), precipitate formed, color change (unexpected)?
These two equations have the same number of oxygen atoms.

What are equations 1 and 3?
This element has the greatest atomic mass of those shown.
What is element E?
What is an ion?
The names for the top and the bottom numbers in this element square.
What are atomic number and atomic mass?
The number of elements in carbon dioxide.
The total number of grams of reactants if the outcome is 10 grams of water and 5 grams of carbon dioxide.
What is 15 grams?
The two elements most likely to form a chemical bond together are ______ and ______. 
What are C and E?