Atomic Structure Worksheet with labeled diagram and questions on atomic particles and properties.

Atomic Structure Worksheet Analysis and Solutions

The worksheet focuses on understanding the structure of an atom, including its subatomic particles (protons, neutrons, and electrons) and their properties. Below is a detailed explanation of each question and its solution.

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#### 1. Label the parts of an atom on the diagram below.
- Proton: Positively charged particle located in the nucleus.
- Neutron: Neutral particle located in the nucleus.
- Electron: Negatively charged particle orbiting the nucleus in energy levels or shells.

The diagram shows:
- Protons and neutrons clustered in the center (nucleus).
- Electrons orbiting the nucleus in circular paths.

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#### 2. What type of charge does a proton have?
- Answer: Positive (+1)

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#### 3. What type of charge does a neutron have?
- Answer: Neutral (0)

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#### 4. What type of charge does an electron have?
- Answer: Negative (-1)

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#### 5. Which two subatomic particles are located in the nucleus of an atom?
- Answer: Protons and neutrons

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#### 6. If an atom has 35 protons in the nucleus, how many electrons will it have orbiting the nucleus?
- Explanation: In a neutral atom, the number of protons equals the number of electrons.
- Answer: 35

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#### 7. What is the atomic number of the atom in the diagram above?
- Explanation: The atomic number is equal to the number of protons in the nucleus.
- From the diagram, there are 5 protons in the nucleus.
- Answer: 5

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#### 8. What is the atomic mass/mass number of the atom in the diagram above?
- Explanation: The atomic mass (or mass number) is the sum of protons and neutrons in the nucleus.
- From the diagram:
- Protons = 5
- Neutrons = 5 (counted from the diagram)
- Mass number = Protons + Neutrons = 5 + 5 = 10
- Answer: 10

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#### 9. How many protons are in the nucleus of an atom with an atomic number of 15?
- Explanation: The atomic number is equal to the number of protons.
- Answer: 15

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#### 10. How many electrons are in the nucleus of an atom with an atomic number of 20?
- Explanation: Electrons do not reside in the nucleus; they orbit the nucleus. Therefore, the number of electrons in the nucleus is 0.
- Answer: 0

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#### 11. How many neutrons are in the nucleus of an atom with an atomic number of 25? (Use the Periodic Table for mass)
- Explanation:
- Atomic number (Z) = 25 (given).
- Atomic mass (approximate) for an atom with Z = 25 can be found on the periodic table: M ≈ 55.
- Neutrons = Atomic mass (M) - Atomic number (Z) = 55 - 25 = 30.
- Answer: 30

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#### 12. What is the mass number of an atom with 3 protons, 4 neutrons, and 3 electrons?
- Explanation:
- Mass number is the sum of protons and neutrons.
- Mass number = Protons + Neutrons = 3 + 4 = 7.
- Note: The number of electrons does not affect the mass number.
- Answer: 7

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#### 13. How many neutrons are in the nucleus of an atom that has an atomic mass of 36 and an atomic number of 25?
- Explanation:
- Atomic mass (M) = 36.
- Atomic number (Z) = 25.
- Neutrons = Atomic mass (M) - Atomic number (Z) = 36 - 25 = 11.
- Answer: 11

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Final Answer Summary

1. Proton: Positive (+1)
2. Neutron: Neutral (0)
3. Electron: Negative (-1)
4. Protons and neutrons are in the nucleus.
5. 35 electrons for 35 protons.
6. Atomic number = 5.
7. Atomic mass = 10.
8. 15 protons for atomic number 15.
9. 0 electrons in the nucleus.
10. 30 neutrons for atomic number 25.
11. Mass number = 7.
12. 11 neutrons for atomic mass 36 and atomic number 25.

Boxed Final Answer:
\[
\boxed{11}
\]