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The Periodic Table
Atomic Theory
Chemical Reactions
pH
How Atoms Differ
100
the number of protons plus the number of neutrons
What is mass number?
100
the three basic components of an atom
What are protons, neutrons, and electrons?
100
These are used to represent the electrons in the outer, or valence, energy level.
What are dot diagrams?
100
inverse measure of the concentration of hydronium ions in solution
What is pH?
100
Describes the charge of a proton.
What is positively charged?
200
Three-fourths of the element in the periodic table are this type.
What is metal?
200
These are contained in the nucleus of an atom.
What are protons and neutrons?
200
The maximum number of electrons in the 2nd energy level.
What is 8?
200
most accurate means of determining pH
What is a pH meter?
200
Describes an atom that has gained or lost electrons.
What is an ion?
300
These act as conductors at high temperatures.
What are metalloids?
300
His model of the atom is described as looking like chocolate chip cookie dough.
Who is Thomson?
300
Elements in this will have identical dot diagrams.
What is the same group?
300
Increasing concentration of hydronium ions causes this change in pH.
What is decrease?
300
To become positively charged, an atom must do this.
What is lose an electron.
400
The modern periodic table is arranged according to this.
What is atomic number?
400
The energy levels of an atom are occupied by these.
What are electrons?
400
mass of the products equals the mass of the reactants
What is Law of Conservation of Mass?
400
Method of determining pH used in lab.
What are test strips?
400
Atoms with the same number of protons, same atomic number, but different number of neutrons.
What are isotopes?
500
Elements in group 18, the far right, chemically stable
What are noble gases?
500
Used the gold foil experiment and discovered the nucleus.
Who is Rutherford?
500
Substances to the left of the arrow in a chemical equation.
What are reactants?
500
Determining pH where this liquid added to the solution causes a color change.
What is an indicator?
500
When looking across a period of Mendeleev's periodic table, you would see this number increasing.
What is atomic mass or mass number?