Conrad: Make the Regents Exam Questions table scroll sideways on narrow screens instead of widening the page

2026-10-25T21:31:18Z

Make the Regents Exam Questions table scroll sideways on narrow screens instead of widening the page

Conrad: Chemistry reference tables (2025 Edition): new reference table page

2026-10-25T19:49:05Z

Chemistry reference tables (2025 Edition): new reference table page

New page

{{Chemreftable
|name=Periodic Table of the Elements
|next=The Electromagnetic Spectrum
|desc=Periodic Table of the Elements from the NYS Chemistry Reference Tables (2025 Edition): atomic number, symbol, name and average atomic mass for elements 1 to 118, with groups 1 to 18 and periods 1 to 7. Supports HS-PS1-1.
}}
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]].

[[File:Periodic Table of the Elements.png|800px|class=img-fluid|alt=Periodic Table of the Elements from the Chemistry Reference Tables (2025 Edition): atomic number, symbol, name and average atomic mass of elements 1 to 118 in groups 1 to 18, with the lanthanides and actinides below]]

== 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.

{| class="wikitable" style="width:100%; text-align:center"
! style="padding: 0.5em 1.5em;" | Exam
! style="padding: 0.5em 1.5em;" | Cluster
! style="padding: 0.5em 1.5em;" | Question
! style="padding: 0.5em 1.5em;" | Standard
|-
| rowspan="8" style="background-color:white;" | [[August 2026 Chemistry Exam|August 2026 Chemistry Regents]]
| style="background-color:white;" | [[Questions:Electricity Generation in New York State|Electricity Generation in New York State]]
| style="background-color:white;" | [[Questions:Electricity Generation in New York State#q3|Question 3]]
| style="background-color:white;" | [[HS-PS1-7]]
|-
| style="background-color:white;" | [[Questions:Semiconductors|Semiconductors]]
| style="background-color:white;" | [[Questions:Semiconductors#q1|Question 14]]
| style="background-color:white;" | [[HS-PS1-1]]
|-
| style="background-color:white;" | [[Questions:Semiconductors|Semiconductors]]
| style="background-color:white;" | [[Questions:Semiconductors#q2|Question 15]]
| style="background-color:white;" | [[HS-PS1-1]]
|-
| style="background-color:white;" | [[Questions:Semiconductors|Semiconductors]]
| style="background-color:white;" | [[Questions:Semiconductors#q3|Question 16]]
| style="background-color:white;" | [[HS-PS1-2]]
|-
| style="background-color:white;" | [[Questions:Semiconductors|Semiconductors]]
| style="background-color:white;" | [[Questions:Semiconductors#q4|Question 17]]
| style="background-color:white;" | [[HS-PS2-6]]
|-
| style="background-color:white;" | [[Questions:Catalytic Converter in Cars|Catalytic Converter in Cars]]
| style="background-color:white;" | [[Questions:Catalytic Converter in Cars#q2|Question 31]]
| style="background-color:white;" | [[HS-PS1-7]]
|-
| style="background-color:white;" | [[Questions:Parade of Balloons|Parade of Balloons]]
| style="background-color:white;" | [[Questions:Parade of Balloons#q1|Question 39]]
| style="background-color:white;" | [[HS-PS1-1]]
|-
| style="background-color:white;" | [[Questions:Parade of Balloons|Parade of Balloons]]
| style="background-color:white;" | [[Questions:Parade of Balloons#q5|Question 43]]
| style="background-color:white;" | [[HS-PS1-8]]
|-
| rowspan="8" style="background-color:white;" | [[June 2026 Chemistry Exam|June 2026 Chemistry Regents]]
| style="background-color:white;" | [[Questions:How Glow Became Gloom|How Glow Became Gloom]]
| style="background-color:white;" | [[Questions:How Glow Became Gloom#q1|Question 1]]
| style="background-color:white;" | [[HS-PS1-8]]
|-
| style="background-color:white;" | [[Questions:How Glow Became Gloom|How Glow Became Gloom]]
| style="background-color:white;" | [[Questions:How Glow Became Gloom#q2|Question 2]]
| style="background-color:white;" | [[HS-PS1-1]]
|-
| style="background-color:white;" | [[Questions:How Glow Became Gloom|How Glow Became Gloom]]
| style="background-color:white;" | [[Questions:How Glow Became Gloom#q3|Question 3]]
| style="background-color:white;" | [[HS-PS1-2]]
|-
| style="background-color:white;" | [[Questions:Equilibria in the Blood|Equilibria in the Blood]]
| style="background-color:white;" | [[Questions:Equilibria in the Blood#q2|Question 12]]
| style="background-color:white;" | [[HS-PS3-5]]
|-
| style="background-color:white;" | [[Questions:Chip Bag: PFAS vs PLA Plastics|Chip Bag: PFAS vs PLA Plastics]]
| style="background-color:white;" | [[Questions:Chip Bag: PFAS vs PLA Plastics#q3|Question 35]]
| style="background-color:white;" | [[HS-PS1-1]]
|-
| style="background-color:white;" | [[Questions:Photosynthetic Pathways|Photosynthetic Pathways]]
| style="background-color:white;" | [[Questions:Photosynthetic Pathways#q2|Question 39]]
| style="background-color:white;" | [[HS-PS1-8]]
|-
| style="background-color:white;" | [[Questions:All About Aluminum|All About Aluminum]]
| style="background-color:white;" | [[Questions:All About Aluminum#q2|Question 43]]
| style="background-color:white;" | [[HS-PS1-2]]
|-
| style="background-color:white;" | [[Questions:Indoor Air Pollution|Indoor Air Pollution]]
| style="background-color:white;" | [[Questions:Indoor Air Pollution#q2|Question 47]]
| style="background-color:white;" | [[HS-PS1-8]]
|-
| rowspan="4" style="background-color:white;" | [[Chemistry sample question clusters|Chemistry sample clusters]] (spring 2025)
| style="background-color:white;" | [[Questions:Smartphone Chemistry Sample Cluster|Smartphone Chemistry]]
| style="background-color:white;" | [[Questions:Smartphone Chemistry Sample Cluster#q1|Question 1]]
| style="background-color:white;" | [[HS-PS1-1]]
|-
| style="background-color:white;" | [[Questions:Smartphone Chemistry Sample Cluster|Smartphone Chemistry]]
| style="background-color:white;" | [[Questions:Smartphone Chemistry Sample Cluster#q3|Question 3]]
| style="background-color:white;" | [[HS-PS1-7]]
|-
| style="background-color:white;" | [[Questions:PSC A Profitable Blueberry Field|A Profitable Blueberry Field]]
| style="background-color:white;" | [[Questions:PSC A Profitable Blueberry Field#q4|Question 4]]
| style="background-color:white;" | [[HS-PS1-7]]
|-
| style="background-color:white;" | [[Questions:PSC Evaluating Gas Stoves|Evaluating Gas Stoves]]
| style="background-color:white;" | [[Questions:PSC Evaluating Gas Stoves#q2|Question 2]]
| style="background-color:white;" | [[HS-PS1-1]]
|}

@@ Line 18: / Line 18: @@
 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.
 {| class="wikitable" style="width:100%; text-align:center"
 ! style="padding: 0.5em 1.5em;" | Exam
@@ Line 107: / Line 108: @@
 | style="background-color:white;" | [[HS-PS1-1]]
 |}

Periodic Table of the Elements - Revision history

Conrad: Make the Regents Exam Questions table scroll sideways on narrow screens instead of widening the page

Conrad: Chemistry reference tables (2025 Edition): new reference table page