Concept explainers
Which of the following is false?
- a. An dement is defined by its atomic number.
- b. Ninety-two elements occur naturally.
- c. An atom consists of subatomic particles.
- d. Electron shells Increase in energy closer to the nucleus.
Introduction:
An atom represents the basic structural unit of elements. Atoms are constituted of subatomic particles which include neutrons, protons, and electrons. An atom contains equal numbers of electrons, protons, and neutrons which makes atom neutral or uncharged as a whole. An element is a substance that cannot be separated or converted into a simpler form. All matter in environment is formed from combination of different elements or same elements. There are ninety two different elements that occur naturally.
Answer to Problem 1MC
Correct answer:
Electrons shells increase in energy closer to the nucleus is a false statement. Therefore, option (d) is correct.
Option (d) is given as “Electrons shells increase in energy closer to the nucleus”.
Explanation of Solution
Justify reason for the correct statement:
Electrons play important role in interactions among atoms. They can capture and release energy, and they also forms the bond that links atoms together into molecules. Electrons revolve around the nucleus in the electron shells. Each electronic shell has a specific energy associated with it. Electron shells which are farthest away from the nucleus have the greatest amount of energy. Electrons shell decrease in energy closer to the nucleus.
Hence, option (d) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “An element is defined by its atomic number”.
Any element present in nature is defined by its atomic number, it is a true statement. Hence, it is a wrong answer.
Option (b) is given as “Ninety two elements occur naturally”.
There are ninety two different elements that occur naturally, it is also a true statement. Hence, it is a wrong answer.
Option (c) is given as “An atom consists of subatomic particles”.
An atom consists of subatomic particles which include electrons, protons, and neutrons, this statement is also true. Hence, it is a wrong answer.
Hence, options (a), (b), and (c) are incorrect.
Electron shell increase in energy closer to the nucleus is a false statement because an electron shell has maximum energy when it is farthest away from the nucleus.
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Biology