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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 Heart3h 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

Atoms- Smallest Unit of Matter

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Atoms- Smallest Unit of Matter

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Multiple Choice

How many valence electrons does an atom with five total electrons have?

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Identify the atomic number of the element, which is equal to the number of protons and, in a neutral atom, also the number of electrons. In this case, the atom has five total electrons.

Determine the electron configuration of the atom. For an atom with five electrons, the configuration is 1s² 2s² 2p¹.

Understand that valence electrons are the electrons in the outermost shell of an atom. For this atom, the outermost shell is the second shell (2s² 2p¹).

Count the electrons in the outermost shell. In this case, there are two electrons in the 2s subshell and one electron in the 2p subshell, totaling three valence electrons.

Conclude that the atom with five total electrons has three valence electrons, as these are the electrons available for bonding in the outermost shell.