Periodic Table of the Elements · Chemistry Reference Tables (2025 Edition)
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The Periodic Table of the Elements from the Reference Tables for Physical Science: Chemistry (2025 Edition) gives the atomic number, symbol, name and average atomic mass of every element. It primarily supports HS-PS1-1, and it is needed wherever a question turns on an element's group, atomic number or molar mass: HS-PS1-2, HS-PS1-7, HS-PS1-8, HS-PS2-6 and HS-PS3-5.
What the periodic table shows
Each box gives an element's atomic number, symbol, name and average atomic mass, as the key (which uses tin) explains. Groups are numbered 1 to 18 across the top and periods 1 to 7 down the side; the lanthanides (58–71) and actinides (90–103) are set out below the main table. A heavy stair-step line, from between aluminum and silicon down to between polonium and astatine, separates the metals on the left from the nonmetals on the right.
Average atomic masses are from the CRC Handbook of Chemistry and Physics, 104th edition (2023–2024), and are given to two decimal places (lead is 207.2). Elements with no stable isotopes have no mass listed: technetium, promethium, polonium, astatine, radon, francium, radium, actinium, and every element from neptunium (93) on.
The table gives only these four pieces of information. The periodic table in the 2011 edition of the Chemistry Reference Tables also listed each element's electron configuration and common oxidation states, and its Table S gave first ionization energies, electronegativities, atomic radii, melting and boiling points and densities. None of that is on the 2025 table. When a question needs such values they are supplied in the question cluster (the August 2026 Safe Transport of Drinking Water cluster gave atomic radii and ionization energies), and otherwise a trend has to be read from an element's position in the table (as in the August 2026 Semiconductors cluster).
Regents Exam Questions
Released Regents questions that cannot be answered without this table, listed by exam. Each link opens the question with its answer key; the standard is the one the question assesses.