Unit 4 Study Guide

Front 1

Atom

Back 1

The smallest piece of an element that has all the properties of that element

Front 2

Atomic Number

Back 2

The number of protons an atom has in its nucleus

Front 3

Bohr Diagram

Back 3

depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus--similar in structure

Front 4

Chemical Symbol

Back 4

First letter of the symbol that represents an element

Front 5

Electron

Back 5

Negatively charged particles that are found outside the nucleus

Front 6

Energy Level

Back 6

a definite stable energy that a physical system can have

Front 7

Family

Back 7

Rows on the Periodic Table the go up and down

Front 8

Isotope

Back 8

one of two or more atoms with the same atomic number but with different numbers of neutrons

Front 9

Mass Number

Back 9

The total number of all the protons plus all of the neutrons in an atoms nucleus

Front 10

Metalloid

Back 10

An element that acts sometimes like a metal and sometimes like a nonmetal

Front 11

Metal

Back 11

A metal is a chemical element that is a good conductor of both electricity and heat

Front 12

Neutron

Back 12

One of the basic particles which make up an atom

Front 13

Non-Metal

Back 13

A substance that conducts heat and electricity poorly, is brittle or waxy or gaseous, and cannot be hammered into sheets

Front 14

Nucleus

Back 14

the positively charged dense center of an atom

Front 15

Period

Back 15

elements are arranged in a series of rows so that those with similar properties appear in vertical columns

Front 16

Periodic Table

Back 16

a table arrangement of the chemical elements according to atomic number

Front 17

Proton

Back 17

a stable particle with positive charge equal to the negative charge of an electron