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Transcript of Atoms
What is an atom ?
RULE 1: Electrons can orbit only at certain allowed distances from the nucleus.
RULE 2: Atoms radiate energy when an electron jumps from a higher-energy orbit to a lower-energy orbit. Also, an atom absorbs energy when an electron gets boosted from a low-energy orbit to a high-energy orbit.
Not until around 460 B.C., did a Greek philosopher, Democritus, develop the idea of atoms. He asked this question: If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further? Democritus thought that it ended at some point, a smallest possible bit of matter. He called these basic matter particles, atoms.
Atoms are the basic building blocks of matter that make up everyday objects.
There are 90 naturally occurring kinds of atoms. Scientists in labs have been able to make about 25 more.
Like your phone, pencil, backpack.
even you are made up of atoms!
Each energy level can accommodate
a certain number of electrons and once
it has accepted its maxium number of
electron's, extra electrons have to move to
another section or orbital, th energy level
closest to the nucleus is called the ground
level and it is always filled first.
Why are we talking about elements? This is the section on atoms. Atoms are the general term used to describe pieces of matter. You are made up of billions and billions of atoms. However, you may only find about 40 elements inside of your body. You would find hydrogen (H) atoms, oxygen (O) atoms, and a bunch of others. Those other atoms are made of the same basic pieces, but they are organized in different ways to make each element unique.
How big is an atom?
The radius of a typical atom is one tenth of a billionth of a meter.
Most of an atom is empty space. Protons and neutrons occupy the nucleus at the center of the atom. Electrons orbit the nucleus like planets around a star. They are grouped in layers called shells.