Test4_StudyGuide

Test4_StudyGuide - Study Guide for Test 4 Chapters 17, 18,...

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1 Study Guide for Test 4 Chapters 17, 18, 19 , and 20 I Periodic Table Periodic table represents different chemical elements. Distinguish between an atom and an element: ! Atom is used to refer to submicroscopic ( invisible !) particles is a sample of matter. ! Element is used for microscopic and macroscopic ( visible!) samples consisting the same type of atoms All chemical elements consist of the same kind of atoms ! Number of different chemical elements is a little bit more than 100. As of today, we know only about 118 elements. How Periodic Table is designed? (a) All elements in Periodic table are organized in accordance with the ncreasing of their atomic numbers. Know the definition! The atomic number (also known as the proton number ) is the number of protons found in the nucleus of an atom. It is traditionally represented by the symbol Z. The atomic number uniquely identifies a chemical element. Atomic mass number is the number of protons and neutrons in a nucleus. Isotopes are the elements that have the same number of protons but different number of neutrons. Important to know : You should understand that if the atomic number of a nucleus ( or, the number of protons, or, the charge of the nucleus) was changed by some reasons, a new element (with respect to the original element) is created. Important properties of Periodic Table: (a) The trend repeats from one horizontal row to the next. Each horizontal row is called a period. (b) Moving down any group (vertical column), the chemical properties of elements are very similar! These vertical associations are called
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This note was uploaded on 05/27/2011 for the course PSC 1121 taught by Professor Khankasayev during the Fall '08 term at Florida A&M.

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Test4_StudyGuide - Study Guide for Test 4 Chapters 17, 18,...

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