Atomic Structure Worksheet for students to label parts of an atom and answer questions about subatomic particles and atomic numbers.

Atomic Structure Worksheet Analysis and Explanation

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)
- Explanation: Protons are positively charged subatomic particles found in the nucleus of an atom. Each proton carries a charge of +1.

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#### 3. What type of charge does a neutron have?
- Answer: Neutral (0)
- Explanation: Neutrons are neutral subatomic particles found in the nucleus of an atom. They do not carry any electric charge.

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#### 4. What type of charge does an electron have?
- Answer: Negative (-1)
- Explanation: Electrons are negatively charged subatomic particles that orbit the nucleus in energy levels. Each electron carries a charge of -1.

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#### 5. Which two subatomic particles are located in the nucleus of an atom?
- Answer: Protons and neutrons
- Explanation: The nucleus of an atom contains protons and neutrons. Electrons are found outside the nucleus, orbiting in energy levels.

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

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

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#### 8. What is the atomic mass/mass number of the atom in the diagram above?
- Answer: 22
- Explanation: The atomic mass (or mass number) is the sum of the number of protons and neutrons in the nucleus. From the diagram:
- Number of protons = 5
- Number of neutrons = 11 (counted from the diagram)
- Mass number = 5 (protons) + 11 (neutrons) = 22

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

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#### 10. How many electrons are in the nucleus of an atom with an atomic number of 20?
- Answer: 0
- Explanation: Electrons do not reside in the nucleus; they orbit the nucleus in energy levels. Therefore, the number of electrons in the nucleus is 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)
- Answer: 30
- Explanation:
- The atomic number (Z) is 25, which means the atom has 25 protons.
- From the periodic table, the atomic mass (approximately) for an atom with Z = 25 is around 55.
- Mass number (A) ≈ 55.
- Number of neutrons = Mass number (A) - Atomic number (Z) = 55 - 25 = 30.

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

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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?
- Answer: 11
- Explanation:
- Atomic number (Z) = 25, which means the atom has 25 protons.
- Atomic mass (A) = 36.
- Number of neutrons = Mass number (A) - Atomic number (Z) = 36 - 25 = 11.

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Final Answer Summary

1. Proton, Neutron, Electron
2. Positive (+1)
3. Neutral (0)
4. Negative (-1)
5. Protons and neutrons
6. 35
7. 5
8. 22
9. 15
10. 0
11. 30
12. 7
13. 11

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