Concept explainers
(a)
Interpretation:
State true and false:
Mendeleev discovered that when elements are arranged in order of increasing atomic weight, certain sets of properties recur periodically.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing
(b)
Interpretation:
State true and false:
Main group elements are those in the columns 3A to 8A of the periodic table.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
(c)
Interpretation:
State true and false:
Non-metals are found at the top of the periodic table, metalloids in the middle, and metals at the bottom.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
(d)
Interpretation:
State true and false:
Among the 118 known elements, there are approximately equal numbers of metals and non-metals.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
(e)
Interpretation:
State true and false:
A horizontal row in the periodic table is called a group.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
(f)
Interpretation:
State true and false:
The group 1A elements are called the “alkali metals”.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
(g)
Interpretation:
State true and false:
The alkali metals react with water to give hydrogen gas and a metal hydroxide, MOH, where “M” is the metal.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
(h)
Interpretation:
State true and false:
The halogens are group 7A elements.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
(i)
Interpretation:
State true and false:
The boiling points of noble gases increase going from top to bottom of the column.
Concept Introduction:
The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.
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Chapter 2 Solutions
Introduction to General, Organic and Biochemistry
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