Atoms
Elements
Periodic Table
Chemical Equations
100
Most of the mass of an atom is here.
What is the nucleus?
100
Has atomic number 2.
What is helium?
100
Elements with full valence shells are in this group.
What are noble gases (group 18)?
100
The small numbers that appear after an element and indicate number of atoms.
What are subscripts?
200
Positively charged particle in an atom.
What is a proton?
200
A diatomic element.
What is either hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, or bromine?
200
Name for elements in Group 1.
What are alkali metals?
200
Numbers put in front of elements or compounds in order to balance equations.
What are coefficients?
300

Particles found in the nucleus of an atom.

What are protons and neutrons?

300
The only nonmetal on the left side of the periodic table.
What is hydrogen?
300

Classification that indicates number of energy levels.

What are periods?

300
Substances that appear to the left of the arrow.
What are reactants?
400
Negatively charged particles found in atoms.
What are electrons?
400

K on the periodic table. 

What is potassium?

400

Charge of elements in group 16.

What is 2-?

400
Mass of reactants is equal to the mass of the products.
What is the law of conservation of mass?
500
An atom that has either lost or gained an electron.
What is an ion?
500
Elements with varying numbers of neutrons.
What are isotopes?
500
Have characteristic of both metals and nonmetals.
What are metalloids?
500
Substances that appear to the right of the arrow.
What are products?
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