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Atoms
Elements
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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?
100

Neon and Argon are members of this group.

What are the noble gases?

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?
200

This atom has 11 electrons.

What is What is Sodium?

300
Protons and Neutrons.
What are particles found in the nucleus of an atom?
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

Name the following compound:  SO3

Sulfur trioxide

300

This atom has an atomic mass of 12.

What is carbon?

400
Negatively charged particles found in atoms.
What are electrons?
400
The four primary elements in living things.
What are carbon, hydrogen, oxygen, and nitrogen?
400

Word that indicates repeating patterns.

What is periodic?

400

Two or more forms of an element that have the same number of protons but a different number of neutrons.

What is an isotope?

400

Magnesium and Calcium are members of this group.

What are the alkaline earth metals.?

500
An atom that has either lost or gained an electron.
What is an ion?
500

Compounds which share electrons.

What is covalent?

500

Has characteristics of both metals and nonmetals.

What are metalloids?

500

A pure substance that cannot be broken down into simpler substances.

What is an element?

500

Material that is stored under high pressure.

What is compressed gas?