horizontal rows of the periodic table are called a. triads. b. elements. c. periods. d. groups. 5) Gaseous elements characterized by low reactivity are found in group ________ of the periodic table. a. 7A b. 8A c. 5A d. 6A 6) Which subatomic particle has the smallest mass? a. a proton b. a neutron c. an alpha particle d. an electron 7) What group of elements does the shaded area in the following periodic table indicate? a.
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copper into tools and weapons. This was easier than the stone that they were originally using. This helped a lot because stones were harder to carve‚ but copper is easy to bend and shape. But what exactly is the element copper? Copper found in the periodic table in Group eleven. Copper is located right before the element gold and the element sliver.
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characteristics that are similar. Also‚ because of their close relations with atoms‚ the Periodic Table can help you determine the similarities of these people and organize them. Purpose: To learn about the organization of the periodic table by using models. Materials: Packets of Chemicool People – fifteen packets with seventeen people – one per group Chemicool People Worksheet – one per group Periodic Table of Elements – one per student Procedure: 1. Remove the Chemicool people from the
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CHEM 101 – General Chemistry I Chapter 2 Reading Assignment Pages 31 - 60 2.1 – What is Matter Made Of? Who 1st discovered atoms – Democritus where the first person to discover atoms. His followers would often think that there were multiple kinds of atoms and not just plain atoms. 2.2 – How Do We Classify Matter? Elements – A substance that consists of identical atoms. Today there are 116 known elements. Example – C= Carbon; H= Hydrogen Compounds – A pure substance made up of two or more elements
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compared to each other it turned out they were in fact‚ the same thing. Although William Gregor was seen as the true and first discoverer of the metal‚ the name Titanium that Klaproth had given it was preferred and kept‚ as it’s official name in the periodic table. Finding this new metal was one thing‚ managing to obtain it though‚ was another. It wasn’t until the year 1910 that Matthew Hunter managed to isolate 99.9% of pure titanium‚ by heating titanium chloride with sodium‚ in a pressure cylinder
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Chapters 11 12 Periodic Table Name __________________ ( ) Class __________ Date _________ History of the Periodic Table Russian chemist Dmitri Ivanovich Mendeleev 1834-1907 Arranged elements in order of increasing atomic masses Elements with similar chemical properties fall into the same vertical column Such an arrangement is the Periodic Table The Periodic Table The Periodic Table is a list of elements arranged in order of ______________ _____________ (__________) ____________. Groups
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Name____________________________ Date_____________ Period____ Periodic Table Worksheet Use a Periodic table to find the information asked for below: 1.What is the atomic number of: Calcium____ Iron _____ Gold_____ Uranium_____ 2. What is the Atomic mass of: Calcium___ Iron_____ Uranium_____ Copper_____ 3. How many protons do the following have? 4. How many electrons do the following have? Calcium have____ Gold have____ Gold_______ Iron_____ Copper______ Copper_____ Iron______ Uranium_____
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Magnesium General Information of The Element Magnesium is the twelfth element on the periodic table. The atomic number is 12‚ and its atomic mass is 24.305. Magnesium’s boiling point is at 1090C or 1994F‚ and its melting point is at 650C or 1202F.Its state of matter is solid. It is located in the second group called the alkaline earth metals. Magnesium is found in seawater‚ salty layers and in many rock minerals. IT could be used as metal. It’s the third most abundant structural metal
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UNIT 1 MATTER‚ CHEMICAL TRENDS AND CHEMICAL BONDING UNIT 1 MATTER AND CHEMICAL BONDING 1.1 The Study of Chemistry Chemistry is the study of matter and its properties‚ the changes (chemical‚ physical‚ and nuclear) that matter experiences‚ and the energy that is associated with these changes. The term STSE refers to science‚ technology‚ society‚ and the environment. These four areas are
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32 b.8 d‚2 e.64 :c 1 a.O Select the letter of the best atoner below. 1 Which of the following is the correct Lewis diagram for corbon? Knowledge and Understanding Chapter 1 B : Na Chapter 1 Elements and the Penindic Table. MHR 45 Si: Lewis diagrams. Drase rhe correct Lewis diagram for each element. a. .• b. . c. 9. Explain what is incorrect about each of the folloss’ing d. the attractive forces among the protons are less than the repulsive forces
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