Periodic table trends in 3D
Pick a property and an element: the bars show how it changes across periods and down groups, with the reasons explained.
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Questions students ask
Why does ionisation energy increase across a period?
The nuclear charge increases while the electrons are in the same shell, so they are held more tightly and need more energy to remove.
Why does atomic radius increase down a group?
Each period adds another shell of electrons, further from the nucleus and shielded by the inner shells.
Free notes on periodic table
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- Introduction to Carbon and its Position in the Periodic Table · CBSE Chemistry carbon and its compounds until chains, branches and rings[excluding it]
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