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Chemistry: Unit 4 - Teach-n-Learn-Chem
Chemistry: Unit 4 - Teach-n-Learn-Chem

... alkali metals: group 1 (except H); 1+ charge; very reactive alkaline earth metals: group 2; 2+ charge; less reactive than alkalis halogens: group 17; 1– charge; very reactive noble gases: group 18; no charge; unreactive lanthanides: elements 57–71 ...
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Periodic Table ppt

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periodic table - rosedalegrade9chemistry
periodic table - rosedalegrade9chemistry

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Review Ch. 4 - Ralston Public Schools
Review Ch. 4 - Ralston Public Schools

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PERIODIC TABLE - WordPress.com
PERIODIC TABLE - WordPress.com

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Periodic Table Funsheet (KEY) 1. What family has the most active
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Chapter 4 Notes - Riverton High School
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... Noble gases are [inert, very reactive, only react with certain elements]. [Potassium, Calcium, Sulfur, Neon] has properties most similar to oxygen. [Calcium, Potassium, Chlorine, Sodium] has two valence electrons. Periods form [horizontal, vertical] rows on the periodic table and show the number of ...
Name: Homeroom
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Periodic Table Powerpoint

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Science Review Sheet: Periodic Table Test Name: ______ Study
Science Review Sheet: Periodic Table Test Name: ______ Study

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Boron group

The boron group are the chemical elements in group 13 of the periodic table, comprising boron (B), aluminium (Al), gallium (Ga), indium (In), thallium (Tl), and ununtrium (Uut). The elements in the boron group are characterized by having three electrons in their outer energy levels (valence layers). These elements have also been referred to as icosagens and triels.Boron is classified as a metalloid while the rest, with the possible exception of ununtrium, are considered post-transition metals. Ununtrium has not yet been confirmed to be post-transition, due to relativistic effects, might not turn out to be one. Boron occurs sparsely, probably because bombardment by the subatomic particles produced from natural radioactivity disrupts its nuclei. Aluminium occurs widely on earth, and indeed is the third most abundant element in the Earth's crust (8.3%). Gallium is found in the earth with an abundance of 13 ppm. Indium is the 61st most abundant element in the earth's crust, and thallium is found in moderate amounts throughout the planet. Ununtrium is never found in nature and therefore is termed a synthetic element.Several group 13 elements have biological roles in the ecosystem. Boron is a trace element in humans and is essential for some plants. Lack of boron can lead to stunted plant growth, while an excess can also cause harm by inhibiting growth. Aluminium has neither a biological role nor significant toxicity and is considered safe. Indium and gallium can stimulate metabolism; gallium is credited with the ability to bind itself to iron proteins. Thallium is highly toxic, interfering with the function of numerous vital enzymes, and has seen use as a pesticide.
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