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.
Want to see more full solutions like this?
Chapter 2 Solutions
Biology
- Which of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All molecules consist of atoms. d. Free radicals are dangerous because they emit energyarrow_forwardWhat is a proton? A. A negatively charged particle B. A positively charged particle C. An element on the periodic table D. Any particle found in the nucleusarrow_forwardThe nucleus of an atom contains: a. neutrons and electrons b. protons and electrons c. protons only d. neutrons and protons e. neutrons onlyarrow_forward
- The atomic number gives thea. number of neutrons in the nucleus.b. number of protons in the nucleus.c. weight of the atom.d. number of protons in the valence shell.arrow_forwardThe name given to the atomic particle found outside the nucleus of an atom isa. proton.b. neutron.c. electron.d. ion.arrow_forwardPlease complete the following question. 3arrow_forward
- What atom has only one proton?a. hydrogen d. a free radicalb. an isotope e. a radioisotopec. helium f. oxygenarrow_forwardA carbon atom contains six protons and six neutrons.A. What are its atomic number and atomic weight?B. How many electrons does it have?C. How many additional electrons must it add to fill its outermost shell? How does this affect carbon’s chemical behavior?D. Carbon with an atomic weight of 14 is radioactive. How does it differ in structure from nonradioactive carbon? How does this difference affect its chemical behavior?arrow_forwardWhich of the following levels in the shell model of an atom can hold up to two electrons? A. The second shell B. The first shell C. The third shellarrow_forward
- All ions have at least one ________ (select all that arecorrect).a. proton c. electronb. neutron d. all of the abovearrow_forwardThe following is made up of two or more different types of elements grouped together as a unit: O a. Cell Ob. Atom O c. Molecule O d. Compound Oe. Tissuearrow_forwardWhich of the following statements are correct? Explain your answers. A. An atomic nucleus contains protons and neutrons. B. An atom has more electrons than protons. C. The nucleus is surrounded by a double membrane. D. All atoms of the same element have the same number of neutrons. E. The number of neutrons determines whether the nucleus of an atom is stable or radioactive. F. Both fatty acids and polysaccharides can be important energy stores in the cell. G. Hydrogen bonds are weak and can be broken by thermal energy, yet they contribute significantly to the specificity of interactions between macromolecules.arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning