Table of contents

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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2:37 minutes

Problem 1

Textbook Question

Which of the following is (are) true concerning the atomic nucleus?
a. It contains the mass of the atom.
b. The negatively charged subatomic particles are here.
c. Subatomic particles can be ejected.
d. It contains subatomic particles that determine atomic number.
e. It contains subatomic particles that interact with other atoms.

Verified step by step guidance

Step 1: Understand the structure of an atom. The atomic nucleus is the central core of an atom, containing protons (positively charged particles) and neutrons (neutral particles). Electrons (negatively charged particles) orbit the nucleus in electron shells.

Step 2: Analyze option (a): 'It contains the mass of the atom.' The nucleus contains protons and neutrons, which contribute almost all the mass of the atom. Electrons have negligible mass in comparison. This statement is true.

Step 3: Analyze option (b): 'The negatively charged subatomic particles are here.' Negatively charged particles (electrons) are not located in the nucleus; they orbit around it. This statement is false.

Step 4: Analyze option (c): 'Subatomic particles can be ejected.' Protons and neutrons in the nucleus can be ejected during nuclear reactions, such as radioactive decay. This statement is true.

Step 5: Analyze options (d) and (e): 'It contains subatomic particles that determine atomic number' and 'It contains subatomic particles that interact with other atoms.' The number of protons in the nucleus determines the atomic number, and protons can interact with other atoms during chemical bonding. Both statements are true.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Atomic Nucleus

The atomic nucleus is the central core of an atom, composed primarily of protons and neutrons. It contains most of the atom's mass due to the high mass of these subatomic particles. The nucleus is positively charged because of the protons, which play a crucial role in determining the atom's identity and properties.

Subatomic Particles

Subatomic particles are the fundamental constituents of atoms, including protons, neutrons, and electrons. Protons and neutrons reside in the nucleus, while electrons orbit around it. The number of protons in the nucleus defines the atomic number, which determines the element's identity, while electrons are responsible for chemical bonding and interactions.

Ejection of Subatomic Particles

Subatomic particles can be ejected from the nucleus through processes such as radioactive decay or nuclear reactions. This ejection can lead to the transformation of one element into another, altering the atomic number and mass. Understanding this concept is essential for grasping nuclear chemistry and the behavior of radioactive materials.

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Textbook Question

Provide the atomic symbol for each of the following elements:

a. Calcium

b. Carbon

c. Hydrogen

d. Iron

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Textbook Question

Provide the atomic symbol for each of the following elements:

e. Nitrogen

f. Oxygen

g. Potassium

h. Sodium

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Textbook Question

Consider the following information about three atoms: 12/6 C 13/6 C 14/6 C

How are they similar to one another?

How do they differ from one another?

What are the members of such a group of atoms called?

Using the planetary model, draw the atomic configuration of 12/6 C, showing the relative position and numbers of its subatomic particles

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Textbook Question

Important functions of water include which of the following?

a. Provides cushioning

b. Acts as a transport medium

c. Participates in chemical reactions

d. Acts as a solvent for sugars, salts, and other solutes

e. Reduces temperature fluctuations

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Textbook Question

Pick out the correct match(es) of element and number of valence electrons. Draw a planetary model of each atom to help you choose the best answer.

a. Oxygen—6

b. Chlorine—8

c. Phosphorus—5

d. Nitrogen—3

e. Carbon—4

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Textbook Question

Define radioactivity. If an element has three isotopes, which of them (the lightest, the one with an intermediate mass, or the heaviest) is most likely to be a radioisotope, and why?

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Textbook Question

Define molecule as it relates to molecular substances and compounds.

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Textbook Question

A substance containing atoms of different elements that are bonded together is called a(n)

(a) Molecule

(b) Compound

(d) Isotope

(e) Solution

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