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The Periodic Table This Section will focus on Scientists who have had an impact on the study of the Periodic Table. Ready To Meet Them? Demitri Mendeleev Demitri Mendeleev was a Russian scientist. He was the first person to make the periodic table. He also wrote a chemistry book.The periodic table is a tool to help read elements. Mendeleev’s Table Modern Periodic Table How to Read the Table Atomic Number Chemical Symbol Element Name 6 2 C 4 carbon Number of Electrons in each energy field 12.01115 Atomic Mass Calculating Atomic Mass To find the Atomic Mass, you look at the bottom number in the Atom tile and round it to the nearest whole number. Atomic Mass 6 C Carbon 12.01115 How to find number of protons Atomic Number/ number of Protons The number of Protons in atom is also the Atomic number, so therefore the Atomic number also represents the amount of Protons in the nucleus of that Atom. 6 C CARBON 12.01115 How to Find the Amount of Neutrons in an Atom To find the amount of neutrons in an atom you have to subtract the atomic mass from the atomic number . Atomic Mass Atomic Number 16 S 2 8 6 sulfur 32.064 32 16 16 Number of protons To determine amount of electrons 6 2 4 C CARBON 12.01115 To find the number of electrons in an atom, look at the numbers in the right side. To determine the number of energy levels count the number of side numbers and there you go!!! How to tell what period the element is listed 33 AS 2 8 18 5 ARSENIC 74.9160 THE 4APPEARS ENERGY IN LEVELS 4TH PERIOD What's the BIG difference The big difference between an element, compound, and a molecule is…… Element: a substance made up of only 1 kind of atom Compound: a substance made up of 2 or more DIFFERENT elements Molecule: a grouping of 2 or more atoms joined together For instance . . . This is an atom of an element. As you can see, it is made up of only one kind of atom H . . In this case Hydrogen Now, with a compound O H O When two or more atoms are put together it makes a compound. How elements are formed Elements are formed with a nucleus, and inside the nucleus is protons and neutrons. Around the nucleus are energy fields, and inside the energy fields are are electrons. Sulfur Vocabulary Electron Neutron Proton Nucleus Compound Atom Isotope element Electron fields Mass Atomic structure Periodic table Chemical symbol Suggested Vocabulary Element name chemist properties matter electron cloud synthetic metal metalloid Solid liquid gas noble gasses subatomic Nonmetals particles Check out some of these helpful websites to do some research of your own . . . •A periodic table of Elements •Periodic Table Adventure •Science Education at Jefferson Lab Contributor's Jessica Osorio Morgan Chacon Julian Rojas Tony Rinaldi Lennis Montoya Josh Quezada Josh Olea Jackie Cakmak Rebekah Flores Karly Perez Nick Waldovogel