good luck

electronegativity down a group

decreases (attraction is weaker)

electronegativity across a period

increases (left to right)

ionization energy across a period

increases

ionization energy down a group

decreases

non reactive group/elements

far right column

nonmetals ?

right side of periodic table, most reactive at top right(flourine)

metals?

left side, most reactive at bottom left (francium)

nonmetal at room temp

can be solid, liquid or gas

metal at room temp

all solid except for mercury that’s liquid

metallioids

kinda stairstepy

good conductors of heat and electricity

metals

poor conductors

non metals

semiconductors

metalloid

metal reactivity across period

decreases

metal reactivity down a group

increases down a group

metallic character down a group

increases

metallic character across a period

decreases

half life formula

figure out how many half lives have gone by (keep dividing). divide time BY number of half lives.

how much og mass formula

Current years DIVIDED BY half life years.  OG mass= mass DIVIDED BY 0.5 to the power of half lives

atomic radius across a period

decrease

atomic radius down a group

increase