The Periodic TableATI TEAS 7 cheat sheet

Reading the grid

9 key facts 5 practice questions Reviewed Oct 2026

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Layout

Groups = vertical columns, same number of valence electrons
Periods = horizontal rows, same number of shells
Arranged by increasing atomic number

Families

Alkali metals (group 1) — very reactive
Halogens (group 17) — very reactive nonmetals
Noble gases (group 18) — full shell, nearly inert

Trends

Atomic radius grows down a group, shrinks across a period
Electronegativity rises across a period, falls down a group

Test yourself first: 5 questions

Question 1 of 5

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

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