Atoms that have the same number of protons but different number of neutrons are called
What is an AMU and what is it used to measure?
atomic mass unit, the mass of an atom
The ___________ of an atom is the ______ of the number of protons and neutrons in all the isotopes of a substance.
Do isotopes that have the same atomic numnber have the same atomic mass?
What are the differences between a hydrogen-1,hydrogen-2,and hydrogen-3 isotope?
different # of neutrons
What holds the negatively charged electrons in a cloud around the neucleus?
positively charged protons
What holds the protons and neutrons together in the nucleus?
strong nucleur force
When one or more electrons are added to or removed from an atom the whole atom has an electric charge, and the atom is called an __________.
Atoms that gain electrons become __________ charged ions.
Atoms that lose electrons become ________ charged ions.
A neutral atom of oxygen has _______ protons and _______ electrons.