Spectrum Light Lab

Electromagnetic Spectrum is a name that scientists give a bunch of types of radiation when they talk about them as a group. Radiation is energy that travels and spreads out as it goes-visible light that comes from the lamp in your house and also radio waves that comes from a radio station. Other examples are microwaves, infrared and ultraviolet light, X-rays and gamma-rays.

If light from a gad element lets say like Neon, like from a neon sign passes through a glass prism. Then neon's atomic emission spectrum is produced.

The atomic emission spectrum of an element is the set of frequencies of the electromagnetic waves emitted by atoms of the element. Only certain colors paperer in an element's atomic emission spectrum means that only certain specific frequencies of light are emitted.

So if you look at elements atomic emission spectrum, it would look like the image above. so the certain colors that show for different elements, means the frequencies of the lights. From red to purple, red has the less amount of energy and purple have's the highest amount of energy.

Atomic Structure

An atom is the smallest unit of an element. An atom is made of neutrons, protons and electons. Protons are the positively charged. Electrons are negatively charged. And Neutrons don't have any charge.
Around 460 B.C., a Greek Philosopher, Democritus, Develop the idea of atoms. His question was: if you break a piece of matter in half, and then break it in half again, how many breaks will you have before you can break no further? So he thought it ended at some point, a smallest possible bit of matter. Which he called these basic matter particles, or atoms.

In 1897, a English physicist J.J. Thomson discover the electron so he thought that matter must have a positive charge. his model looked like raisins stuck on a lump of pudding.



Virtully all the mass of an atom is in the nucleus, because the electrons weigh so little.

The number of protons = Atomic Number of the atom

The number of protons + number of neutrons = Mass Number of then atom