There are ____ different atoms on the ____ In Ancient Greece, ____ was the first person to propose the idea of the atom. In 1897 ____ discovered the electron and then went on to propose a model for the structure of the atom called the "chocolate chip cookie dough model." In 1911, ____ discovered the "nuclear model," which states that atoms have a nucleus that is very small, dense and positively charged. Then ____ modified it in 1914, by introducing the idea of energy levels. ____ are the fundamental building blocks of Chemistry. ____ is made up of a bunch of different types of atoms. For example, sugar is made up of carbon atoms, oxygen atoms, and hydrogen atoms. The ____ is in the center of the atom. It contains ____ and ____. ____ are outside the nucleus. The Periodic Table has a lot of good information for Chemistry. It shows the ____ of each element. The Atomic number tells the ____ in the nucleus. The ____ is the same as the number of protons, so the # of protons = the # of electrons. The ____ is also on the Periodic Table, and it equals the number of neutrons plus the number of protons. To find the ____, subtract the number protons from the Mass number.

Introduction to Chemistry

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