Free Printable Atomic Structure Worksheets - Free Printable

Problem Analysis:

The worksheet focuses on the basic atomic structure and properties of elements. Let's solve each part step by step.

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Part 1: Labeling Parts of an Atom

The diagram shows a simplified model of an atom. The parts to be labeled are:
- Nucleus: The central part containing protons and neutrons.
- Protons: Positively charged particles in the nucleus.
- Neutrons: Neutral particles in the nucleus.
- Electrons: Negatively charged particles orbiting the nucleus.

#### Answers:
- Label the central region as the nucleus.
- Label the small circles inside the nucleus as protons and neutrons.
- Label the outer orbits as the regions where electrons are located.

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Part 2: Subatomic Particles of Elements

We need to determine the number of protons (P), neutrons (N), and electrons (E) for the given elements based on their atomic numbers and mass numbers.

#### Step-by-Step Solution:

1. Carbon (C)
- Atomic Number (Z): 6
- Protons (P) = Atomic Number = 6
- Electrons (E) = Atomic Number = 6
- Mass Number (A): 12 (approximately, from the average atomic mass)
- Neutrons (N) = Mass Number - Atomic Number = 12 - 6 = 6

Answer for Carbon:
- P = 6, N = 6, E = 6

2. Neon (Ne)
- Atomic Number (Z): 10
- Protons (P) = Atomic Number = 10
- Electrons (E) = Atomic Number = 10
- Mass Number (A): 20 (approximately, from the average atomic mass)
- Neutrons (N) = Mass Number - Atomic Number = 20 - 10 = 10

Answer for Neon:
- P = 10, N = 10, E = 10

3. Potassium (K)
- Atomic Number (Z): 19
- Protons (P) = Atomic Number = 19
- Electrons (E) = Atomic Number = 19
- Mass Number (A): 39 (approximately, from the average atomic mass)
- Neutrons (N) = Mass Number - Atomic Number = 39 - 19 = 20

Answer for Potassium:
- P = 19, N = 20, E = 19

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Part 3: Completing the Table Using the Periodic Table

We need to fill in the missing values in the table using the relationships:
- Atomic Number (Z) = Number of Protons = Number of Electrons (for neutral atoms)
- Mass Number (A) = Number of Protons + Number of Neutrons

#### Step-by-Step Solution:

1. Row 1: Sodium (Na)
- Symbol: Na
- Atomic Number: 11 (from periodic table)
- Mass Number: Atomic Number + Number of Neutrons = 11 + 12 = 23
- Number of Protons: 11
- Number of Electrons: 11
- Number of Neutrons: 12

Filled Row:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| Na | 11 | 23 | 11 | 11 | 12 |

2. Row 2: Potassium (K)
- Symbol: K
- Atomic Number: 19 (from periodic table)
- Mass Number: 39 (given)
- Number of Protons: 19
- Number of Electrons: 19
- Number of Neutrons: Mass Number - Atomic Number = 39 - 19 = 20

Filled Row:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| K | 19 | 39 | 19 | 19 | 20 |

3. Row 3: Strontium (Sr)
- Atomic Number: 38 (from periodic table)
- Mass Number: Atomic Number + Number of Neutrons = 38 + 50 = 88
- Number of Protons: 38
- Number of Electrons: 38
- Number of Neutrons: 50

Symbol: Sr (Strontium)

Filled Row:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| Sr | 38 | 88 | 38 | 38 | 50 |

4. Row 4: Fluorine (F)
- Symbol: F
- Atomic Number: 9 (from periodic table)
- Mass Number: Atomic Number + Number of Neutrons = 9 + 10 = 19
- Number of Protons: 9
- Number of Electrons: 9
- Number of Neutrons: 10

Filled Row:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| F | 9 | 19 | 9 | 9 | 10 |

5. Row 5: Calcium (Ca)
- Atomic Number: 20 (given)
- Mass Number: 40 (given)
- Number of Protons: 20
- Number of Electrons: 20
- Number of Neutrons: Mass Number - Atomic Number = 40 - 20 = 20

Symbol: Ca (Calcium)

Filled Row:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| Ca | 20 | 40 | 20 | 20 | 20 |

6. Row 6: Bromine (Br)
- Atomic Number: 50 (given)
- Number of Electrons: 50
- Number of Neutrons: 69 (given)
- Mass Number: Atomic Number + Number of Neutrons = 50 + 69 = 119
- Number of Protons: 50

Symbol: Br (Bromine)

Filled Row:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| Br | 50 | 119 | 50 | 50 | 69 |

7. Row 7: Iodine (I)
- Atomic Number: 53 (given)
- Mass Number: 127 (given)
- Number of Protons: 53
- Number of Electrons: 53
- Number of Neutrons: Mass Number - Atomic Number = 127 - 53 = 74

Symbol: I (Iodine)

Filled Row:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| I | 53 | 127 | 53 | 53 | 74 |

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Final Answer:

1. Labeling Parts of an Atom:
- Central region: Nucleus
- Small circles inside: Protons and Neutrons
- Outer orbits: Electrons

2. Subatomic Particles:
- Carbon: P = 6, N = 6, E = 6
- Neon: P = 10, N = 10, E = 10
- Potassium: P = 19, N = 20, E = 19

3. Completed Table:
| Symbol | Atomic Number | Mass Number | Number of Protons | Number of Electrons | Number of Neutrons |
|--------|---------------|-------------|--------------------|---------------------|--------------------|
| Na | 11 | 23 | 11 | 11 | 12 |
| K | 19 | 39 | 19 | 19 | 20 |
| Sr | 38 | 88 | 38 | 38 | 50 |
| F | 9 | 19 | 9 | 9 | 10 |
| Ca | 20 | 40 | 20 | 20 | 20 |
| Br | 50 | 119 | 50 | 50 | 69 |
| I | 53 | 127 | 53 | 53 | 74 |

Boxed Final Answer:
\[
\boxed{
\begin{array}{|c|c|c|c|c|c|}
\hline
\text{Symbol} & \text{Atomic Number} & \text{Mass Number} & \text{Number of Protons} & \text{Number of Electrons} & \text{Number of Neutrons} \\
\hline
\text{Na} & 11 & 23 & 11 & 11 & 12 \\
\hline
\text{K} & 19 & 39 & 19 & 19 & 20 \\
\hline
\text{Sr} & 38 & 88 & 38 & 38 & 50 \\
\hline
\text{F} & 9 & 19 & 9 & 9 & 10 \\
\hline
\text{Ca} & 20 & 40 & 20 & 20 & 20 \\
\hline
\text{Br} & 50 & 119 & 50 & 50 & 69 \\
\hline
\text{I} & 53 & 127 & 53 & 53 & 74 \\
\hline
\end{array}
}
\]