How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
small center of the atom that contains protons and neutrons
the large volume of the atom that contains only electrons
the number of protons in an atom.
a bond between polar molecules such as water......oil is non polar
amount of matter
the attractive force that depends on gravity and mass
a substance with large heavy particles, a fixed shape and volume
a substance with some attraction between the particles , and a fixed volume but changeable shape
a substance with light particles and little or no attractive forces between them
substance particle with a positive charge
subatomic particles with a neutral charge and a mass of 1
subatomic particle with a negative charge and almost no mass