
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
- Plating 50 microliters of a sample diluted by a factor of 10-6 produced 91 colonies. What was the originalcell density (CFU/ml) in the sample?arrow_forwardEvery tutor here has got this wrong, don't copy off them.arrow_forwardSuppose that the population from question #1 (data is in table below) is experiencing inbreeding depression (F=.25) (and no longer experiencing natural selection). Calculate the new expected genotype frequencies (f) in this population after one round of inbreeding. Please round to 3 decimal places. Genotype Adh Adh Number of Flies 595 Adh Adh 310 Adhs Adhs 95 Total 1000 fladh Adh- flAdn Adh fAdhs Adharrow_forward
- Which of the following best describes why it is difficult to develop antiviral drugs? Explain why. A. antiviral drugs are very difficult to develop andhave no side effects B. viruses are difficult to target because they usethe host cell’s enzymes and ribosomes tometabolize and replicate C. viruses are too small to be targeted by drugs D. viral infections usually clear up on their ownwith no problemsarrow_forwardThis question has 3 parts (A, B, & C), and is under the subject of Nutrition. Thank you!arrow_forwardThey got this question wrong the 2 previous times I uploaded it here, please make sure it's correvct this time.arrow_forward
- This question has multiple parts (A, B & C), and under the subject of Nutrition. Thank you!arrow_forwardCalculate the CFU/ml of a urine sample if 138 E. coli colonies were counted on a Nutrient Agar Plate when0.5 mls were plated on the NA plate from a 10-9 dilution tube. You must highlight and express your answerin scientific notatioarrow_forwardDon't copy off the other answer if there is anyarrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningBiology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781337408332Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage Learning




