Atomic structure

Physics

Who had the first idea of the existence of an atom and when?

^^john Dalton, 200 years ago^^

**What particles are atoms made of?**

^^protons, neutrons and electrons^^

What is within the nucleus and what orbits?

^^nucleus=protons and neutrons^^

^^orbit= electrons^^

What are two properties of protons, neutrons and electrons that are especially important?

^^mass and electrical charge^^

What is the number above a element?

^^mass number^^

What is the number below a element?

^^atomic number^^

How to count protons?

^^atomic Number from periodic table^^

How to count neutrons?

^^mass Number minus the number of protons^^

How to count electrons?

^^same as protons^^

What is an isotope?

^^atoms of the same element always have the same number of protons, they may have different numbers of neutrons^^

What are the properties of an isotope?

^^the isotopes of an element are identical in their chemical reactions.^^

How small is an atom?

^^thickness of a crisp^^