The number of isotopes of elements with even mass number and even atomic number are ________________?
Correct answer: C. 154
- A. 280
- B. 300
- C. 154
- D. 54
Explanation
For isotopes with even atomic number and even mass number, both the proton number and neutron number are even, a combination that gives especially stable nuclei because nucleons are paired. The standard tabulated count for this classification is 154. Students may choose b if they remember a total isotope count or another parity category rather than the specific even-even group.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
Practise Fundamental Concepts of Chemistry
894 free Fundamental Concepts of Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Moles and Avogadro's Number questions
Which one of the following has the maximum number of isotopes ?
The number of moles of CO2 which contains 16 g of oxygen is__________________?
Percentage of calcium in calcium carbonate is___________________?
Which of the following statements about isotopes is correct ?
Molecular mass of water (18g) means__________________?
Jimmy went to a hospital to take some laboratory tests. After he had gotten the result, he found out that the count of his red blood cells was 2.7 x 10^6/uL. The doctor said that the normal adult male hemoglobin count is 13.5 g /100 mL. A low hemoglobin count would result in anemia, and a high hemoglobin count would result in polycythemia. If you were the doctor, identify the condition of Jimmy. Hemoglobin is (C2952H4664O832S8Fe4). One red blood cell has approximately 270 million hemoglobin molecules.