Why did they form at that time? Astronomers know from observing distant exploding stars that the size of the universe has ...

Atoms are the basic building blocks of matter, and understanding their composition is a fundamental aspect of chemistry and physics. One of the most crucial aspects of an atom is understanding the ...

From the burning of wood to the action of medicines, the properties and behavior of matter are governed by the way chemical ...

Kelling Donald does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...

When building an atom, pay close attention to the particles' electrical charges. Protons have a charge of +1. Electrons have a charge of -1. Neutrons are neutral, as its name implies. A stable atom ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. “What is radium and why is it dangerous?” – ...

An element's atomic number defines it. An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons. So ...