Science Ch. 6 Review

The proton has a negative charge.

The rapid reaction of any substance with oxygen

Anything that takes up space and has mass

A neutral atom has an equal number of protons and electrons.

The three main groups of elements are metal, nonmetals, and semimetals.

The colorless, odorless gas that makes up 78% of the earth's atmosphere

The tiny, extremely dense core at the center of an atom

The semimetal that is used to make computer chips

A process in which atoms of elements or compounds are rearranged to form new substances

The positively charged particles in the nucleus

Two or more atoms firmly bonded together form a neutron.

The study of what substances are made of and how one substance can be changed into another

An element is a substance that is composed of only one type of an atom.

Highly reactive elements that tend to form compounds with alkali and alkaline earth metals

The amount of matter that makes up an object

Lacking an electrical charge

The element that is the basic building block of all the compounds

The densest of the everyday metals

The neutral particles in the nucleus

A very hard metal which is an important ingredient in stainless steel

The tiny particles of which all matter is composed

The number of protons an atom has

The organized arrangement of all known elements

The only metal that is liquid at room temperature

If two objects have the same volume but different densities, the object made of the denser substance weighs less.

The measure of the pull of gravity on an object

Two electrons attract each other.

The weight of an object changes from place to place.

The tiny particles that swarm at tremendous speeds around the core of an atom

The most abundant element at the surface of the earth

Formed by electrons zooming around the nucleus of an atom

The elements which do not combine with anything else except under unusual conditions

The simplest kind of atom with one proton and one electron

A mixture is a substance composed of one or more types of atoms bonded together.

Iodine, when heated, does not melt but instead sublimes, or turns to gas.

Most metals are _________.

The halogen that is added to toothpaste and drinking water

The hardest of all known substances

Formed by electrons that are in orbit the same distance from the nucleus

The metric unit that is used to measure an object's mass

The halogen that is added to table salt to prevent a deficiency disease

The amount of matter in one unit of volume

A compound made of charged atoms

A compound made of molecules

The halogen that is useful as a bleach and a germ-killing agent