chemistry / Atomic & Molecular / free
Periodic Trends
Change nuclear pull and shielding to see the periodic table become a set of patterns.
Follow the cause1 / 3
Inner electrons shield. Outer electrons feel less than the full nuclear charge because inner electrons partially screen the nucleus.
periodic trend modelZᵉᶠᶠ = 4.0
Focus the idea
effective charge4.0
relative radius0.90
ionization8.00
electronegativity1.20
The nucleus pulls with an effective charge of 4.0 after shielding is accounted for.
Periodic trends are not isolated memorization rules. They emerge from nuclear charge, shielding, and distance competing to control the outer electrons. Occupied shells follow from Z for the neutral atom, and shielding can never exceed the Z − 1 other electrons.
04 / PRACTICE
0 / 3 checkedMake the chemistry yours.
Answer from the model, then use the explanation to connect the particle picture to the chemical rule.
CHECK 1 / 3