Periodic Trends - Atomic weight increases from left to right and top to bottom because atoms increase in the number of protons and neutrons

Periodic Trends - Atomic size/radius increases from top to bottom because of the addition of shells in groups -Atomic size/radius decreases from left to right because electrons remain the same distance away from the nucleus in a shell, but the number of protons increases which leads to electrons pulled further in and thus smaller radii in periods

Periodic Trends -Electronegativity is the ability of an atom to pull electrons to itself -a higher electronegativity means that the atom is able to pull electrons to itself very well -a lower electronegativity means the atoms is not able to pull electrons to itself very well

Periodic Trends -Electronegativity increases from left to right and decreases from top to bottom -explanation: more protons with less shells leads to an atom that can pull electrons away from other atoms very well

Periodic Trends -Ionization energy is the energy required to pull an electron away from the outermost shell of an atom -a higher ionization energy means it is harder to pull an electron away from that atom -a lower ionization energy means that it is easier to pull an electron away from that atom

Periodic Trends -ionization energy trends follow similar patterns to electronegativity (ie. increases left to right and bottom to top -if an atom is able to pull electrons to itself well, it will likewise not easily give up electrons

Periodic Trends -explanation: -shielding effect (group): more shells create a “shielding” effect that diminishes the force of the nucleus on the outermost e- -electrons remain the same distance away from the nucleus in a shell, but the number of protons increases which leads to greater attraction