Many elements found in nature exist as
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The elements of a group have the same number of _valence electrons_____ in their _outer_____shell. 7. Every element in group one has ___1______ electron in its outer shell.
[DOCX File]Mifflin County School District
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Name the two most reactive elements in this group. _____ _____ What happens when these metals are exposed to water? _____ Click on . Alkaline Earth Metals. located on the left hand side under Element Groups. Answer the following questions. What is the group number? _____ Are these metals reactive? _____ Do these metals occur freely in nature ...
[DOCX File]H Unit 4: Periodic Table
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The elements in each of these two periods share many properties. The lanthanides are shiny and reactive. The actinides are all radioactive and are therefore unstable. Elements 95 through 103 do not exist in nature but have been manufactured in the lab. Color the lanthanides and actinides brown.
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Activity 2.1 A Quick Review of Elements and Compounds. 1. Table 2.1 (page 31) lists the chemical elements that occur naturally in the human body. Similar percentages of these elements are found in most living organisms.
[DOC File]Chapter 20 – The Representative Elements: Group 5A Through …
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Oxygen is the most abundant element and accounts for 49.5% (by mass) of all elements found in the Earth’s crust; it is also the most abundant element (about 65% by mass) in the human body. Elemental oxygen makes up about 23% (by mass, or 21% by volume) of the Earth’s atmosphere.
[DOC File]Chapter 21 Worksheet 1
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An element can exist in various forms called . isotopes. Isotopes have the same number of protons (atomic number) but a different number of neutrons so they have different mass numbers. Elements in nature exist as a mixture of isotopes. The . atomic mass. given in the periodic table is the . average mass number + the mass of the electrons.
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Dec 16, 2011 · Many elements found in nature exist as . 3. What is a molecule? 4. Compounds that are formed when two or more atoms combine to form molecules are called . 5. Circle the letter of the substances that do NOT exist as molecules in nature. a. oxygen d. ozone b. water e. helium c. neon. 6. List two general properties of molecular compounds. a. b. 7.
[DOC File]STUDENT STUDY GUIDE FOR 8TH GRADE CHEMISTRY
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About how many elements are there? 20 50 100 200 The elements in the periodic table are arranged by. ... The element carbon can exist in three states in nature – as graphite, diamond, or buckey balls. ... Many of these compounds are found in petroleum. The number of possible carbon based compounds is very, very large. ...
[DOC File]Color Coding the Periodic Table
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The elements in each of these two periods share many properties. The lanthanides are shiny and reactive. The actinides are all radioactive and are therefore unstable. Elements 95 through 103 do not exist in nature but have been manufactured in the lab. Group 13: Boron Family/Group –Reactive. Aluminum is in this group.
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