To Study Science, This is One Thing You Need to Know

The most important idea in physics is that everything in the universe is made of atoms. Atoms are tiny particles that make up everything from the stars in the sky to the water in a river. Atoms are made of even smaller particles called protons, neutrons and electrons. The atoms that make up all the stars and planets in our solar system were made inside a star long ago.





Protons and neutrons are the same size but electrons are tiny compared to them. The proton is like a ball, with a positive charge, while the neutron is like a ball with no charge. An electron is about 1/1836 the size of a proton or neutron, so it is very tiny indeed.


In an atom there is one smaller particle called a neutron. It has no charge and it also has nearly half as much mass as a proton. Protons have an electric charge that causes magnetic fields to form around them, but neutrons have no electric charge and do not form magnetic fields. This means that protons can push each other away if they get too close together, but neutrons push each other closer together rather than pushing away from each other. This means that atoms made only of neutrons will break apart because they will push themselves into each other too closely!


How do you know if an atom has electrons? You can’t see them from outside the atom because they are on the outside, but you can find out by looking at what happens when light hits them. When light hits an electron it changes direction and moves off in a different direction. This means that light bounces off of electrons because they have a negative charge and move away from positive charges. Electrons also bend light, which means that they change how fast light moves through space. This means that electrons have mass and it takes energy to move them around when they are hit by something like light or electricity.


This also explains why water is different from oil; oil does not have any negative charges on its surface so electrons do not bounce off or bend around it when light hits them or electricity moves through them! Water has lots of negatively charged electrons on its surface which bounce off other things and make water look shiny when you look at it or give water electricity-repelling properties!


One of the best ways to understand how big atoms are is to think about the size of a molecule. A molecule is two or more atoms all stuck together. Water, hydrogen sulphide and ammonia are all examples of molecules made up of two different kinds of atom. In molecules, an atom and another type of atom are bonded together, but they can still move around on their own! The molecules that make up gases like water, hydrogen sulfide and ammonia are very small; in fact, they are so small that you would need to line up one million molecules end to end just to be able to see them from outside the gas!

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