If we look very closely at some grains of salt, we will see that each grain has the same shape. Salt grains are shaped…

Atomic Mass Number - What is Atomic Mass Number? The total number of neutrons and protons in the nucleus (core) of an…

What is a Proton? Protons are positively charged (+1), quite the opposite, as the electric charge of electrons (-1). …

Nuclear power stations use a radioactive material called uranium as an energy source to make electricity. Radioactive …

In the center of every atom is the nucleus.   This is made of tiny particles called protons and neutrons . Protons hav…

The world is changing around us all the time. There are physical changes as matter changes from solid to liquid t…

Air is a mixture of many different gases.  These different gases are very useful. But they must be separated from ea…

Knives, forks, ships, trucks, and even bridges can be made from different types of steel.  Steel is very strong and is …

Which drink do you prefer— lemonade or sweet tea? One is a weak acid and the other is a weak alkali. If not for some…

Structure of an Atom - What is the Structure of an Atom? Atoms are composed of smaller particles called protons, neut…

Atom - small basic building block of matter.  All materials on Earth are composed of different combinations of atoms…