Chapter 2 Chemistry, Matter, and Life Vocab

The science that deals with the composition of matter and the changes that may occur in that composition

-Anything that has mass and takes up space
-Solids, liquids, and gasses

-Can be described as weight and used interchangeably

-What matter is composed of, living and nonliving
-The simplest form of matter
-Cannot be broken down into a simpler form by ordinary chemical means
-90 naturally occurring
-16 man-made

21; oxygen, carbon, hydrogen, nitrogen, calcium, phosphorus, potassium, sulfur, sodium, chlorine, magnesium, fluorine, chromium, manganese, iron, cobalt, copper, zinc, selenium, molybdenum, iodine

-The smallest particle of an element that still retains the properties of that element; unbelievably small
-Made up of protons, neutrons, and electrons

A dense region that contains protons and neutrons

-Outside the nucleus
-Negatively charged
-Almost no mass
-Their number and arrangement determine how an atom reacts

-Located in the nucleus
-Positively charged
-Has the mass of 1 AMU

Atomic Mass Unit

The number of protons in the nucleus

-Found in the nucleus
-Have the same mass as protons
-Have no charge (neutral)

Protons and Neutrons account for the mass of an atom. This is their collective number.

The number of negatively charged electrons in an atom is always equal to the number of positively charged protons.

-High energy levels are further from the nucleus
-Where the electrons are located