Terms
Definitions
Elements
Identify
Questions
100

The tiny particles that make up matter

Atoms

100
Lacking an electrical charge

Neutral

100

The most common alkaline earth metal; an ingredient in calcium carbonate

Calcium

100

A nobel gas used in balloons and lasers

Helium

100

What is a geometric arrangement of atoms called?

A crystal

200

The tiny, extremely dense core of an atom

Nucleus
200

A substance that is composed of only one type of atom bonded together

Element

200

A solid halogen that sublimes when heated; used in iodized salt and medical antiseptics

Iodine

200

A noble gas used in signs and lasers

Neon

200
What is the process in which atoms of elements or compounds are rearranged to form new substances?

Chemical reaction

300

One of the two kinds of particles that make up the nucleus of an atom; has a neutral charge

Neutrons

300

One of the two kinds of particles that make up the nucleus of an atom; has a positive charge

Protons

300
A common alkali metal that is an ingredient in table salt and lye; also used in street lights

Sodium

300

A halogen used in toothpaste, coolants, Teflon, and high-powered military lasers

Fluorine

300

What is a tiny group of two or more atoms that are bonded tightly together?

Molecule

400

The shield or cloud formed by fastmoving electrons in an atom that prevents other atoms from moving into the same space

Electron Cloud
400

A substance that is composed of more than one type of atom bonded together

Compound

400

The most widely used halogen; used in bleach, disinfectants, and PVC; an ingredient in table salt

Chlorine

400

a halogen that is liquid at room temperature; used in photographic film

Bromine
400
What is the name for the elements in the last column of the periodic table; are gases and do not combine with other elements except under very unusual circumstances?

Noble gases

500

Tiny particles in an atom that circle the nucleus at tremendous speed

Electrons

500

A set of electrons in an atom that orbit the nucleus at roughly the same distance

Shell

500

A strong but lightweight alkali metal used in parts for airplanes and some cars

Magnesium

500

A noble gas commonly used as filler in incandescent light bulbs; the most plentiful of the noble gases

Argon

500

What are compounds composed of charged atoms or groups of atoms called?

Ionic compounds
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