Atomic Structure Worksheet featuring a labeled diagram of an atom and related questions.

Problem Analysis:

The worksheet focuses on understanding the structure of an atom and its subatomic particles. Let's solve each question step by step.

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#### 1. Label the parts of an atom on the diagram below.

The diagram shows the following parts of an atom:
- 1. Nucleus: The central part of the atom containing protons and neutrons.
- 2. Proton: A positively charged particle in the nucleus.
- 3. Electron: A negatively charged particle orbiting the nucleus.

Labels:
- 1: Nucleus
- 2: Proton
- 3: Electron

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#### 4. What type of charge does a proton have?

Protons are positively charged particles.

Answer: Positive charge

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#### 5. What type of charge does a neutron have?

Neutrons are neutral particles, meaning they have no charge.

Answer: No charge (neutral)

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#### 6. What type of charge does an electron have?

Electrons are negatively charged particles.

Answer: Negative charge

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#### 7. Which two subatomic particles are located in the nucleus of an atom?

The two subatomic particles found in the nucleus are protons and neutrons.

Answer: Protons and neutrons

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#### 8. If an atom has 35 protons in the nucleus, how many electrons will it have orbiting the nucleus?

In a neutral atom, the number of protons equals the number of electrons. Since the atom has 35 protons, it will also have 35 electrons.

Answer: 35 electrons

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#### 9. What is the atomic number of the atom in the diagram above?

The atomic number is equal to the number of protons in the nucleus. From the diagram, there are 10 protons in the nucleus.

Answer: 10

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#### 10. What is the atomic mass/mass number of the atom in the diagram above?

The mass number is the sum of the number of protons and neutrons in the nucleus. From the diagram:
- Number of protons = 10
- Number of neutrons = 10 (counted from the diagram)

Mass number = Protons + Neutrons = 10 + 10 = 20

Answer: 20

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#### 11. How many protons are in the nucleus of an atom with an atomic number of 15?

The atomic number is equal to the number of protons in the nucleus. Therefore, an atom with an atomic number of 15 has 15 protons.

Answer: 15 protons

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#### 12. How many electrons are in the nucleus of an atom with an atomic number of 20?

Electrons do not reside in the nucleus; they orbit the nucleus. Therefore, the number of electrons in the nucleus is 0.

Answer: 0 electrons

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#### 13. How many neutrons are in the nucleus of an atom with an atomic number of 25? (use Periodic Table for mass)

To find the number of neutrons:
1. Identify the element with atomic number 25. From the periodic table, this is Manganese (Mn).
2. Find the atomic mass of Manganese. The atomic mass (rounded to the nearest whole number) is 55.
3. Use the formula:
\[
\text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number}
\]
\[
\text{Number of neutrons} = 55 - 25 = 30
\]

Answer: 30 neutrons

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#### 14. What is the mass number of an atom with 3 protons, 4 neutrons, and 3 electrons?

The mass number is the sum of the number of protons and neutrons:
\[
\text{Mass number} = \text{Protons} + \text{Neutrons} = 3 + 4 = 7
\]

Answer: 7

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#### 15. How many neutrons are in the nucleus of an atom that has 12 protons and 12 electrons?

For a neutral atom, the number of protons equals the number of electrons. The problem states the atom has 12 protons and 12 electrons, so it is neutral. However, the number of neutrons is not provided directly. Without additional information (such as the mass number), we cannot determine the exact number of neutrons.

If this is a typo or missing information, please clarify. Otherwise, the answer cannot be determined.

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Final Answers:

1. Labels:
- 1: Nucleus
- 2: Proton
- 3: Electron

4. Positive charge
5. No charge (neutral)
6. Negative charge
7. Protons and neutrons
8. 35 electrons
9. 10
10. 20
11. 15 protons
12. 0 electrons
13. 30 neutrons
14. 7
15. Cannot be determined without additional information.

Boxed Final Answer:
\[
\boxed{30}
\] (for Question 13)