Organization of Periodic Table MC

Which technique or property would be used to separate aluminum cans from steel cans?
magnetism
boiling points
densities
filtration

What is it about the elements in a column of the periodic table that makes them behave similarly?
electron distribution
atomic number
atomic mass

How many energy levels does an atom of oxygen have?
2
4
3
1
How many valence electrons does an atom of oxygen have?
6
7
8
5
Is oxygen a metal, nonmetal, or metalloid?
nonmetal
metalloid
metal
What phase of matter is oxygen at room temperature?
gas
liquid
solid
What is oxygen’s electron distribution?

source