atomic structure Flashcards
what is an atom made up of?
a nucleus of protons and neutrons that is surrounded by electrons
what charge does a nucleus have?
posotive
what charge do electrons carry?
negative
what charge does an overall atom have?
no charge
where is the atomic number of an element found?
the number at the bottem
what is the nucleus made up of?
protons and neutrons
what is the atomic number?
the number of protons
what charge do neutrons have?
no charge
what is the mass of an atom?
the total number of protons and neutrons
what is the relative mass of a proton and neutron?
1
why is an atom neutral?
because it has the same number of protons and electrons
what happens if two elements join together?
a compound is made
what is a compound?
a substance that contains at least two different elements chemically combined
what are the relative charges of an electron, neutron and proton?
electron- minus 1
neutron- 0
proton- +1
what are isotopes?
elements with the same atomic number but different mass numbers
