Chemistry Chapter 4 And 5 Vocab

Front 1

Conversion factor

Back 1

a ratio of equivalent measurements used to convert a quantity fromone unit to another

Front 2

Dimensional Analysis

Back 2

a technique of problem solving that uses the units that are part ofa measurement to help solve the problem

Front 3

Alkali Metal

Back 3

any metal in group 1A of the periodic table

Front 4

Alkaline earth Metals

Back 4

Any metal in groups 2A of the periodic table

Front 5

Atom

Back 5

the smallest particle of an element that retains the properties ofthat element

Front 6

Atomic Mass

Back 6

the weighted average of the masses of the isotopes of an element

Front 7

atomic mass unit (amu)

Back 7

a unit of mass equal to one twelfth the mass of a carbon-12 atom

Front 8

Atomic Number

Back 8

The number of protons in the nucleus of an atom of an element

Front 9

Cathode Ray

Back 9

a stream of electrons produced at the negative electrode (cathode)of a tube containing a gas at low pressure

Front 10

Dalton's Atomic Theory

Back 10

the first theory to relate chemical changes to events at the atomiclevel

Front 11

Electron

Back 11

a negatively charged subatomic particle

Front 12

Group

Back 12

a vertical column of elements in the periodic table; the constituentelements of a group have similar chemical and physical properties

Front 13

Halogen

Back 13

any member of the non-metallic elements in Group 7A of the periodictable

Front 14

Inner Transition Metal

Back 14

an element on the lanthanide and actinide series; characterized byaddition of electrons to f orbi

Front 15

Isotope

Back 15

atoms of the same element that have the same atomic number butdifferent atomic masses sue to a different number of neutrons

Front 16

Mass Number

Back 16

the total number of protons and neutrons in the nucleus of an atom

Front 17

Metal

Back 17

one of a class of elements that includes a large majority of theknows elements, metals are characteristically lustrous, malleable,ductile, and good conductors of heat and electricity

Front 18

Metalloid

Back 18

one of a class of elements having properties intermediate to metalsand nonmetals

Front 19

Neutron

Back 19

a subatomic particle with no charge and a mass of 1 amu; found in the nucleus of the atom

Front 20

noble gas

Back 20

any member of a group of gaseous element in group 0 of the periodictable; the s and p sublevles of theiroutermost energy level are filled

Front 21

nonmetal

Back 21

one of a class of elements that are not lustrous and are generallypoor conductors of heat and electricity; non metals are grouped onthe right side of the periodic table

Front 22

nucleus

Back 22

the dense central portion of an atom, composed of protons andneutrons

Front 23

Period

Back 23

a horizontal row of elements on the periodic table

Front 24

periodic law

Back 24

when the elements are arranged in order of increasing atomic number,there is a periodic repetition of their physical and chemicalproperties

Front 25

Periodic table

Back 25

an arrangement of elements into rows and columns according tosimilarities in their properties

Front 26

Proton

Back 26

a positively charged subatomic particle found in the nucleus of anatom

Front 27

Representative element

Back 27

Group A element on the periodic table; together, these elementswhich have only partially filled outermost s and p sublevels, illustrate the entire range ofchemical properties

Front 28

Transition metals

Back 28

Group B element characterized by addition of electrons to d suborbitals