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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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