The “lead” of a pencil is actually made of a substance called graphite which is made of carbon atoms. The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and ...

Students look more deeply into the structure of the atom and play a game to better understand the relationship between protons, neutrons, electrons, and energy levels in atoms and their location in ...

A chemical element is one of those squares on the periodic table that adorns many a classroom ... are made of protons, neutrons and electrons. It is the number of protons, otherwise known as ...

Now in its sesquicentennial year, it is still an indispensable tool used to explain (and predict) chemical interactions and to infer various characteristics of the elements, such as reactivity, ...

Perhaps its greatest claim to fame on the periodic table is that it defines the start of the most obscure of the artificial ... This is a convenient half-life as it means the alpha particles - nuclei ...

based on the total number of protons and neutrons in each element’s atomic nucleus). “The mass of each of the elements didn’t put them in the right place in the periodic table according to ...

These nuclei had specific numbers of protons or neutrons, or magic numbers, as physicist Eugene Wigner called them. The race ...