Unit 2: Atoms, Molecules, & Ions

Front 1

Atomic Theory

Back 1

All matter is comprised of atoms

Front 2

Elements

Back 2

are only comprised of one type of atom each having identical properties

Front 3

chemical reaction

Back 3

consists of a rearrangements og atoms providing a new chemical

Front 4

atomic symbol

Back 4

one or two letter notation used to represent an atom corresponding to a certain elements

Front 5

Nucleus

Back 5

the core made up of protons and neutrons, overral positive charge contains most of the atoms mass

Front 6

electrons - the outer sphere

Back 6

negligible mass. overall negative charge, traveling in orbitals around nucleus

Front 7

proton

Back 7

nuclear particle containing a positive charge (equal and opposite to that an electron) that contains 1800 times more mass than an electron

Front 8

atomic number

Back 8

the number of protons in the nucleus of an atom

Front 9

neutron

Back 9

nuclear particle having a similar mass to a proton but with not electrical charge

Front 10

Mass number

Back 10

total number of protons and neutrons in the nucleus

Front 11

Nuclide

Back 11

an atom characterized by a definite atomic number and mass number

Front 12

isotope

Back 12

are atoms whose nuclei have the same atomic number but different mass number

Front 13

atomic mass unit

Back 13

the mass equal to exactly one twelfth the mass of carbon-12 atom

Front 14

atomic weight

Back 14

the average atomic mass for the naturally occurring elements

Front 15

fractional abundance

Back 15

of an isotopes the fraction of the total number of atoms that is comprised of a particular isotope

Front 16

atomic weight of an element by seeing the masses of the isotopes and

Back 16

multiply each isotope mass by the fractional abundance then add up the products

Front 17

periods/series

Back 17

the elements in any one horizontal row

Front 18

group/family

Back 18

the elements in any one vertical column

Front 19

metals

Back 19

elements to the left of the staircase- substance or mixture that has a characteristic luster and is generally of heat and electricity

Front 20

nonmetals

Back 20

elements to the right of the staircase- an element that does not exhibit metallic properties most gases

Front 21

metalloid

Back 21

most elements bordering the staircase elements having both metal and nonmetal properties

Front 22

chemical formula

Back 22

notation that uses atomic symbols with numerical subscripts to convey relative proportions of elements

Front 23

molecule

Back 23

groups of atoms that are chemically bound

Front 24

molecular formula

Back 24

exact # of atoms of an element for the molecule

Front 25

ionic compounds

Back 25

compound composed of cations and anions

Front 26

ion

Back 26

electrically charged particle obtained from an atom or chemically bonded group of atoms by adding or removing electrons

Front 27

anion

Back 27

negatively charged ion that gain electron

Front 28

cation

Back 28

positively charged ion that lost electron

Front 29

organic compounds

Back 29

substances that contain carbon chemically combined with other elements such as H, O, and N

Front 30

inorganic compounds

Back 30

composed of elements other than carbon

Front 31

Group1/Alkali Metals

Back 31

all have 1+ charges

Front 32

Group / Alkaline earth metals

Back 32

all have 2+ charges

Front 33

Group 13

Back 33

all have 3+charges except for borob