Identify the element from its atomic structure in this educational worksheet.

To solve the problem, we need to identify each atom based on its electron configuration and use the periodic table to determine the corresponding element. Let's analyze each atom step by step:

Key Points:

1. Protons: The number of protons in the nucleus determines the atomic number of the element.
2. Electrons: Electrons are distributed in shells around the nucleus. The outermost shell is called the valence shell.
3. Periodic Table: Use the atomic number (number of protons) to identify the element.

Step-by-Step Analysis:

#### Atom A:
- Protons: 8
- Electrons: 8 (2 in the first shell, 6 in the second shell)
- Element: Oxygen (O)

#### Atom B:
- Protons: 17
- Electrons: 17 (2 in the first shell, 8 in the second shell, 7 in the third shell)
- Element: Chlorine (Cl)

#### Atom C:
- Protons: 5
- Electrons: 5 (2 in the first shell, 3 in the second shell)
- Element: Boron (B)

#### Atom D:
- Protons: 10
- Electrons: 10 (2 in the first shell, 8 in the second shell)
- Element: Neon (Ne)

#### Atom E:
- Protons: 2
- Electrons: 2 (2 in the first shell)
- Element: Helium (He)

#### Atom F:
- Protons: 1
- Electrons: 1 (1 in the first shell)
- Element: Hydrogen (H)

#### Atom G:
- Protons: 9
- Electrons: 9 (2 in the first shell, 7 in the second shell)
- Element: Fluorine (F)

#### Atom H:
- Protons: 6
- Electrons: 6 (2 in the first shell, 4 in the second shell)
- Element: Carbon (C)

#### Atom I:
- Protons: 12
- Electrons: 12 (2 in the first shell, 8 in the second shell, 2 in the third shell)
- Element: Magnesium (Mg)

Final Answers:

- A: Oxygen (O)
- B: Chlorine (Cl)
- C: Boron (B)
- D: Neon (Ne)
- E: Helium (He)
- F: Hydrogen (H)
- G: Fluorine (F)
- H: Carbon (C)
- I: Magnesium (Mg)

Boxed Answer:

\[
\boxed{
\begin{array}{ccc}
\text{A: Oxygen (O)} & \text{B: Chlorine (Cl)} & \text{C: Boron (B)} \\
\text{D: Neon (Ne)} & \text{E: Helium (He)} & \text{F: Hydrogen (H)} \\
\text{G: Fluorine (F)} & \text{H: Carbon (C)} & \text{I: Magnesium (Mg)}
\end{array}
}
\]