electrons and outer shells Flashcards
what is indirect evidence?
collateral facts
what are energy levels
fixed distance from nucleus (usually holds electrons)
what are valence numbers
number of valence electrons in the outer level
what is an ionic bond
an atom losing electrons then gaining them
what is an isotope
the same elements with the same amount of protons, but different neutrons
what are ions
an atom with one or more negative or positive electrical charges
what is a covalent bond
atoms joined together by sharing electrons
what is a polyatomic ion
an ion made up of many atoms
what is atomic mass
the weighted mass of an element
what is an atomic number
the amount of protons
what are subscripts
numbers used to specify the numbers of atoms
who is the original periodic table creator
Dmitri Mendeleev
