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?
A: 
B:
C:
A
B
C