Number of electrons = 18 and so number of protons = 18. Hence atomic number = 18 Number of protons + neutrons = 18 + 22 = 40. Hence mass number = 40The chemical symbol for argon with its mass ...

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 ...

This energy level model shows two electrons on the first energy level and six electrons on the second energy level. Since this atom has a total of eight electrons, it also has eight protons ... 3rd ...

Quarks are the reason protons have a positive charge. Each quark has a fraction of an electric charge. A proton has two up ...

By definition, every atom of a given element has a specific number of protons in its ... a rock sample with neutrons and thereby convert the potassium-40 to argon-39, an isotope not normally ...

To get to grips with it, it helps to first understand that atoms, the basic units of all matter, are made of protons, neutrons and electrons. It is the number of protons, otherwise known as the ...