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Chapter 2: Q. 2.1 P (page 81)
What is the key difference between an element and a compound?
An element is made up of the same type of atoms while a compound is formed by combining different elements in a fixed ratio.
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The elements inGroupsandare all quite reactive. What is the major difference between them?
Give the name, atomic symbol, and group number of the element with the following Zvalue, and classify it as a metal, metalloid, or nonmetal:
(a) Z = 32 (b) Z = 15 (c) Z = 2 (d) Z = 3 (e) Z = 42
Magnesium oxide (MgO) forms when the metal burns in the air.How many grams of Mg are in534 g of MgO?
Describe Thomson鈥檚 model of the atom. How might it account for the production of cathode rays?
Correct each of the following statements:
(a) In the modern periodic table, the elements are arranged in order of increasing atomic mass.
(b) Elements in a period have similar chemical properties.
(c) Elements can be classified as either metalloids or nonmetals.
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