structure of an atom Flashcards
a nucleus is made of up…
neutrons and protons
electrons are in the…
shells
hint: think about the structure of the nucleus
the relative mass of neutrons and what are the same?
protons
the relative mass of electrons are
VERY small - usually written as 0
the relative mass of neutrons and protons are
both 1
the charges are what?
electrons - minus 1
neutrons - 0
protons - plus 1
the size of an atom depends on
what element it is
what is an molecule?
two or more atoms bonded together
if an atom does not have balanced charges, it is called a what?
an ion
on the periodic table the bottom number is called the…
ATOMIC NUMBER
on the periodic table the top number is called the…
MASS
the atomic number means what…
how many protons the element has
(and because electrons and protons are equal, it also tells us the electrons)
the mass number means what…
how many NEUTRONS and PROTONS an element has
the number of which two charges are the same?
protons and electrons
the definition of an isotope:
an element with the same number of protons but a different number of neutrons
OR
Isotopes are atoms with the same atomic number, but different mass numbers
