Questions and Answers
Which of the following is a characteristic of nonmetals?
Low density and high electronegativity
What tends to be the nature of oxides of nonmetals?
Acidic
Which elements make up the overwhelming majority of the Earth's crust, atmosphere, oceans, and biosphere?
Hydrogen, carbon, nitrogen, oxygen, and silicon
Which industries benefit from the specific uses of nonmetallic elements?
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Which two nonmetallic elements make up about 98% of the observable ordinary matter in the universe by mass?
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Which set is denoted as R or R $\mathbb{R}$ in mathematics?
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What distinguishes real numbers from imaginary numbers?
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What type of numbers include the integer -5 and the fraction 4/3?
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What are the real numbers that are not roots of a polynomial with integer coefficients called?
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How can real numbers be thought of in terms of a line?
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Study Notes
Characteristics of Nonmetals
- Nonmetals tend to be poor conductors of heat and electricity
- Oxides of nonmetals are acidic in nature
Elemental Composition of the Earth
- The overwhelming majority of the Earth's crust, atmosphere, oceans, and biosphere are composed of nonmetal elements
Industries Benefiting from Nonmetallic Elements
- Electronics industry (silicon and other nonmetals are used in computer chips)
- Aerospace industry (carbon fiber, a nonmetal, is used in aircraft and spacecraft)
- Steel industry (manganese, a nonmetal, is used to remove impurities from steel)
Abundance of Nonmetallic Elements in the Universe
- Hydrogen and helium, two nonmetallic elements, make up about 98% of the observable ordinary matter in the universe by mass
Real Numbers in Mathematics
- The set of real numbers is denoted as R or $\mathbb{R}$ in mathematics
- Real numbers are distinguished from imaginary numbers by having no imaginary part
- Real numbers include integers (such as -5) and fractions (such as 4/3)
- Real numbers that are not roots of a polynomial with integer coefficients are called transcendental numbers
- Real numbers can be thought of as points on a continuous line
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