Observing God's World chapter 6

hardest known substance

added to table salt to help people get this

the number of protons of any element

the only metal liquid at room temperature

one proton and one electron element

the basic building block element of all living compounds

process in which elements join and rearrange to form something new

a substance made of only one type of atom

electrons _?_ each other

charged atoms becoming a compound

the three main groups of elements are: semimetals, nonmetals and _?_

a rapid reaction because of oxygen

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

lacking an electrical charge

The amount of matter that makes up an object

formed by zooming electrons around a nucleus

The two particles that make up the nucleus of an atom

in order for an atom to be neutral the number of protons and electrons must be ?

proton's charge

The measure of the pull of gravity on an object

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

study of subtances and how they act

two or more atoms firmly bound together

how much matter is in one unit of volume

colorless, odorless gas which is 78% of earth's atmosphere

Anything that takes up space and has mass

elements which do not combine with any other element; except under extreme circumstances

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

an object's _?_ changes from place to place

the earth's surface most abundant element

2 objects of same volume have different densities must have different _?_

the halogen in bleach and germ-killing items

the helpful element in stainless steel

highly reactive elements, especially with alkali and alkaline metals

a substance of two or more elements bonded together

an organized arrangement of all known elements

a compound made of molecules

when an element turns from solid to gas without becoming a liquid first (iodine)

a halogen which is added to drinking water and toothpaste

metals are normally what state of matter?

computer chips are made of this metal

all matter is composed of ?

electron's charge

What type of scientists have we been in this chapter?