Answer:
atomic radii
Step-by-step explanation:
fancy word for this is Quantum Mechanics
Atomic Shielding Effect
1. Atomic radii = size of an atom
2. How much the nucleus attracts the outer electrons and how much the outer electrons repel each other makes atomic radii
3. Inner electrons between the nucleus and outer electrons create a shield that protects the outer electrons from the full force of the nucleus.
4. Shield reduces the pull on the outer electrons, making the atom bigger.
5. Electron affinity is how much an atom wants more electrons.
6. Ionization energy is the energy needed to take an electron away from an atom.
7. Electronegativity is how good an atom is at pulling electrons towards itself in a bond.
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