Todd Helmenstine


About Todd Helmenstine

Todd Helmenstine is the physicist/mathematician who creates most of the images and PDF files found on sciencenotes.org. Nearly all of the graphics are created in Adobe Illustrator, Fireworks and Photoshop. Todd also writes many of the example problems and general news articles found on the site.



2D and 3D Shapes Word Search
Word search puzzles are a fun method to introduce glossary terms to students. This 2D and 3D shapes word search consists of 18 different shapes. These shapes can be found vertically, horizontally, and diagonally as well as forwards and backward. The word search is optimized to fit on a standard 8.5″ […]

2D and 3D Shapes Word Search Puzzle



Nonmetals Word Search
Wordsearches are a fun method to introduce glossary terms to students. This nonmetals word search contains 18 nonmetal elements from the periodic table. The nonmetals can be found vertically, horizontally, and diagonally as well as forwards and backward. The wordsearch is optimized to fit on a standard 8.5″ x 11″ […]

Nonmetals Word Search Puzzle


Color Periodic Table without Names - 118 Elements
Here is a 118 element periodic table without names of the elements included on the table. Color Periodic Table without Names The first table is a color version of the periodic table without the element names included. This table has the atomic numbers, element symbols, and atomic masses rounded to […]

Printable Periodic Table without Names


Aurora Borealis
Nanometers ( nm ) and angstroms ( Å ) are linear measurements used to describe very small distances. These measurements often appear in applications of spectroscopy and the sizes of atoms. This example problem shows how to convert nanometers to angstroms. Convert Nanometers to Angstroms Example Problem Question: The vivid […]

How to Convert Nanometers to Angstroms