Yearly Archives: 2019

If you live in a place that gets winter, you know (or may be) a person who steps outdoors, sniffs the airs, and declares it “smells like snow.” Others might not be keen on weather prediction, but swear the fluffy, white flakes have a distinctive aroma. Can you tell when […]

Can You Smell Snow?

Electronegativity trend of the periodic table
Electronegativity is a measure of how easily an atom attracts a pair of electrons to form a chemical bond. A high electronegativity value means an atom readily attracts electrons to form a chemical bond with another atom. A low electronegativity value means an atom readily donates electrons to form a […]

Electronegativity Definition and Trend

Hydrogen Isotopes
Isotopes are forms of an element that have different numbers of neutrons. All isotopes of an element have the same atomic number and number of protons, but they have different atomic masses from each other. Isotopes of an element share similar chemical properties, but have different nuclear properties. Every element […]

What Is an Isotope? Definition and Examples

Periodic Table of Radioactive Elements
Technetium is a radioactive element, with no stable isotopes. With an atomic number of 43, it is the lightest unstable element. All of the elements surrounding it on the periodic table have at least one stable isotope. What is it about technetium that makes it special? The short answer is […]

Why Is Technetium Radioactive?