atoms and elements test

family / group

vertical column, similar properties

period

horizontal row

group 1a

alkali metals

group 2a

alkaline earth metals

group 3-12

transition metals

as you go from left to right…

elements go from metals to nonmetals

Group 7a

halogens

group 8a

noble gases

which subatomic particle determines the identity of an atom

proton

protons

in nucleus, positive, 1 amu mass

neutrons

in nucleus, neutral, 1amu mass

electrons

outside of nucleus, negative, almost zero

where is most mass of an atom

in nucleus

non metal

right side, any state, low melting point, vary in color, poor conductor

metalloid

border metal and nonmetal (on staircase), solid at room temp, shiny or dull. melting points vary, semi conductor

metals

left side, usually solid sometimes liquid, ductile and malleable, high melting points vary, good conductor