chapter 6 ionization Flashcards
who arranged the elements according to atomic number?
henry moseley
what is the octet rule?
elements gain or lose electrons to attain a noble configuration (metals lose to look like noble, nonmetals gain)
how do more protons affect the atomic radius?
more protons = tighter/stronger magnetic force
what is the difference between alkaline and noble gas valences?
alkaline : +1 valence
noble gas : +8 valence
describe atomic size trend
radius increases as you go down a group bc electrons are added to larger energy levels
radius decreases toward right in period
ionization energy
energy required to remove electrons from a gaseous atom
describe ionization trend
decreases moving down group
increases moving right across period
electrons closer to nucleus thus attraction increases
electronegativity
equal opposite to ionization, trend is the same
the tendency for atoms to attract electrons when they are chemically combined with another element
who listed the elements by atomic mass?
demetri mendeleev
where are halogens located
group 7A
where are chalcogens located
group 6A
how does reactivity increase for nonmetals?
nonmetals gain electrons and ionization increases as you move across a period
