Periodic TrendsHESI A2 cheat sheet

Patterns across and down

8 key facts 3 practice questions Reviewed Oct 2026

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Atomic Radius

Increases down a group (more shells)
Decreases across a period (stronger nuclear pull)

Electronegativity

Increases across a period
Decreases down a group
Fluorine is the most electronegative

Ionization Energy

Energy to remove an electron
Increases across, decreases down

Reactivity

Metals most reactive at the bottom left; nonmetals at the top right

Key takeaway

Patterns across and down

Before you read

Test yourself first: 3 questions

Question 1 of 3

The elements on the left and center of the periodic table are mostly:

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