Unit 2A Chemistry Vocabulary Review

Most reactive group of nonmetals

• noble gases
• halogens
• alkaline earth
• rare earth

ability to reflect light

• malleable
• luster
• ductile
• conductive

C-14 vs. C-12

• ions
• cations
• anions
• isotopes

melting point

• physical change
• physical property
• chemical change
• chemical property

horizontal row on the periodic table

• group
• family
• period

Able to be hammered into thin sheets

• ductile
• malleable
• lustrous
• conductive

number of protons in an element

• atomic mass
• mass number 
• atomic number
• charge

describes how a substance will react 

• chemical property
• chemical change
• physical property
• physical change

most active metals

• halogens
• noble gas
• alkaline earth metals
• alkali metals

part of the atom that contains the protons and neutrons

• electron cloud
• group
• isotope
• nucleus