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1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart2h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Isotopes

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Isotopes

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Multiple Choice

The most common form of calcium has 20 protons, 20 neutrons, and 20 electrons. Which of the following elements would be an isotope of calcium?

An atom with 21 protons, 20 neutrons, and 21 electrons

An atom with 20 protons, 20 neutrons, and 18 electrons

An atom with 21 protons, 21 neutrons, and 21 electrons

An atom with 20 protons, 21 neutrons, and 20 electrons

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Verified step by step guidance

Understand the concept of isotopes: Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Identify the atomic number: The atomic number is determined by the number of protons in the nucleus of an atom. For calcium, the atomic number is 20, as it has 20 protons.

Analyze the given options: To find an isotope of calcium, look for an atom with the same number of protons (20) but a different number of neutrons.

Evaluate each option: Check each option to see if it has 20 protons. Only the atom with 20 protons, 21 neutrons, and 20 electrons fits the criteria for being an isotope of calcium.

Conclude the solution: The correct isotope of calcium is the atom with 20 protons, 21 neutrons, and 20 electrons, as it maintains the same atomic number but has a different neutron count.