Ozone (O3) is made of three atoms of oxygen. It is . a mixture
an ion
a molecule
an element

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

Why is the melting of ice a physical change ?

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule