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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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Why was it necessary for separation techniques and methods of chemical analysis to be developed before the laws of definite composition and multiple proportions could be formulated?
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.
Fill in the blanks:
(a) The symbol and atomic number of the heaviest alkaline earthmetal are ________ and ________.
(b) The symbol and atomic number of the lightest metalloidin Group 4A(14)are ________ and ________.
(c) Group 1B(11) consists of the coinage metals.The symbol and atomic mass of the coinage metal whose atoms have the fewest electrons are________ and ________.
(d) The symbol and atomic mass of the halogen in Period 4 are ________ and ________.
Describe the type and nature of the bonding that often occurs between two nonmetals.
Each scene below represents a mixture. Describe each one in terms of the number of elements and/or compounds present.
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