Concept explainers
What atom has only one proton?
a. hydrogen | c. a free radical |
b. an isotope | d. a radioisotope |

Introduction:
An atom is defined as the smallest unit of a substance. Atoms contain protons, electrons, and neutrons. Elements are pure substances that are composed of atoms. Molecules are formed by the interaction of atoms with the help of a chemical bond.
Answer to Problem 1SQ
Correct answer:
The hydrogen atom has only one proton. Hence, the correct answer is option a.
Explanation of Solution
Reason for correct answer:
Option a. is given as “hydrogen.”
Atoms are defined as the basic units of matter. An atom is composed of a central core called nucleus. Protons are the positively charged particles in an atom that occupy the nucleus; neutrons are the uncharged particles present in the nucleus; and electrons are the negatively charged particles that move around the nucleus. An element is defined as a substance that is made up of one type of atoms. Hydrogen is the simplest element as its atom has a nucleus consisting of one proton.
Reason for incorrect answer:
Option b. is given as, “an isotope.”
Isotopes refer to the variants of the same element that contain the same number of protons, but different number of neutrons. However, hydrogen is the simplest element that contains one proton. This indicates that the isotopes of different elements have a different number of protons. Hence, option b. is incorrect.
Option c. is given as, “a free radical.”
Atoms that contain unpaired electrons are known as free radicals. Free radicals are highly unstable. They may force electrons upon other atoms or drag electrons away from them. This property makes them dangerous. This indicates that free radicals do not contain proton. Hence, option c. is incorrect.
Option d. is given as, “a radioisotope.”
Radioisotopes are the isotopes containing unstable nucleus that emits radiation on decay. During the decay of carbon 14, one neutron splits into a proton and an electron. The electron is emitted as radiations. This indicates that the radioisotopes of different elements contain different number of protons. Hence, option d. is incorrect.
Hence, the options b., c., and d. are incorrect.
Hydrogen is the simplest element that contains only one proton in the nucleus. Thus, the correct answer is option a.
Want to see more full solutions like this?
Chapter 2 Solutions
EBK BIOLOGY: CONCEPTS AND APPLICATIONS
- C MasteringHealth MasteringNu X session.healthandnutrition-mastering.pearson.com/myct/itemView?assignment ProblemID=17396422&attemptNo=1&offset=prevarrow_forwardMost people, even those who exercise regularly at low to average intensity (1 hour at the gym or a 2- to 3-mile walk several times per week), do not need an increased protein intake. What would be the protein needs of a man named Josh who exercises moderately and is the same age and size as Wayne? Josh is 5 ft, 8 in tall and weighs 183 lb. Round the number of grams to the nearest whole number. During calculations, use numbers rounded to the first decimal place. Because protein requirement is a range, please enter two numbers: lower and upper range values, respectively. Separate the lower and upper range values, in that order, by a comma. ___, ___ g ?arrow_forwardC MasteringHealth MasteringNu X session.healthandnutrition-mastering.pearson.com/myct/itemView?assignment ProblemID=17396422&attemptNo=1&offset=prevarrow_forwardIf left untreated, most HIV-infected individuals will develop AIDS. Current treatments are focused on highlyactive antiretroviral therapy (HAART). HAART usually consists of an orally delivered drug cocktail containingtwo different reverse transcriptase inhibitors and one other drug, such as a protease inhibitor. Question: Develop a pharmacokinetic model of HAART treatment. Consider all 3 drugs. Make sure to include adiagram that illustrates your thinking, state all assumptions, and define your variables. Whatparameters would you need to know to find the concentration of drug in the plasma? In the T cells?(You do not need to write out or solve any equations.)arrow_forwardnot use ai pleseaarrow_forward(A) 25 20 20 15 NPP (Mg C/ha/yr) 10 10 5 0 0 2,000 4,000 6,000 ECOLOGY 4e, Figure 20.11 (Part 1) 2017 Sinauer Associates, Inc. Average annual precipitation (mm) 8,000arrow_forwardexplain the cascade of events (starting with relaxing trade winds) that occurs during El Niño in the eastern Pacific (off the coasts of California/North America and Peru/South America) and which lead to food-chain collapse - start with changes in the physical/oceanographic conditions, andthen systematically describe the cascading effects at each level of the food chain -arrow_forward3) Which statement(s) about the Pacific Decadal Oscillation (PDO) is/are TRUE? CIRCLE ALL THAT APPLY. A. It is a major driver of salmon populations in the Pacific B. It affects sea surface temperatures in the eastern Pacific C. Its cycles typically do not last as long as those of ENSO D. Evidence that it has occurred over many centuries has been gathered from tree ring dataarrow_forward4.arrow_forward2arrow_forward1. 2. 3. Marine fish cells are hypotonic compared to their seawater environment; their cells lose water by osmosis and gain solutes. If you add heterotrophic respiration and autotrophic respiration together and then subtract that value from gross primary productivity, then you have a more refined estimate of ecosystem carbon storage than NEE. Differential heating due to the earth's tilt generates the global wind AND oceanic circulation patternsarrow_forward1arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_iosRecommended textbooks for you
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage LearningBiology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage LearningBiology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning