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1	Chapter Three Atomic Structure and the Periodic Table
2	Atomic Structure and the Periodic Table
3	Atomic Structure and the Periodic Table cont’d The protons and neutrons of an atom are found in the central nuclear region, or nucleus, and the electrons are found in an electron cloud outside the nucleus.
4	Atomic Structure and the Periodic Table cont’d
5	Atomic Structure and the Periodic Table cont’d
6	Atomic Structure and the Periodic Table cont’d Mendeleev constructed a periodic table as part of his effort to systemize chemistry.
7	Atomic Structure and the Periodic Table cont’d The periodic table of the elements is a graphical way to show relationships among the elements.
8	Atomic Structure and the Periodic Table cont’d In this periodic table, elements 58 through 71 and 90 through 103 are shown in their proper positions.
9	Atomic Structure and the Periodic Table cont’d Some familiar metals are aluminum, lead, tin, and zinc.
10	Atomic Structure and the Periodic Table cont’d
11	Atomic Structure and the Periodic Table cont’d This portion of the periodic table shows the dividing line between metals and nonmetals.
12	Atomic Structure and the Periodic Table cont’d The number of subshells within a shell is equal to the shell number.
13	Atomic Structure and the Periodic Table cont’d
14	Atomic Structure and the Periodic Table cont’d
15	Atomic Structure and the Periodic Table cont’d
16	Atomic Structure and the Periodic Table cont’d The order of filling various electron subshells. Subshells of different shells “overlap.”
17	Atomic Structure and the Periodic Table cont’d The order of filling various electron subshells with electrons follows the same order given by the arrows in this diagram.
18	Atomic Structure and the Periodic Table cont’d The different colors of fireworks result when heat excites the electrons of different kinds of metal atoms.
19	Atomic Structure and the Periodic Table cont’d Electron configuration and the positions of the elements in the periodic table.
20	Atomic Structure and the Periodic Table cont’d A classification scheme for the elements based on their electron configurations.