An atom diagram with labeled parts and questions about atomic structure.

Problem Analysis:

The image shows a diagram of an atom with labeled parts and a key identifying protons, neutrons, and electrons. The task is to analyze the atom and answer questions about its structure, including the number of protons, neutrons, electrons, atomic number, mass number, electron configuration, group, and identity.

Step-by-Step Solution:

#### 1. Counting Protons in the Nucleus:
- Protons are represented by red circles.
- Count the red circles in the nucleus.
- There are 8 protons.

#### 2. Counting Neutrons in the Nucleus:
- Neutrons are represented by green circles.
- Count the green circles in the nucleus.
- There are 8 neutrons.

#### 3. Determining the Number of Electrons:
- In a neutral atom, the number of electrons equals the number of protons.
- Since there are 8 protons, there must be 8 electrons.

#### 4. Explanation for Electron Count:
- The atomic number (number of protons) determines the number of electrons in a neutral atom.
- Here, the atomic number is 8, so there are 8 electrons.

#### 5. Atomic Number of the Element:
- The atomic number is equal to the number of protons.
- There are 8 protons, so the atomic number is 8.

#### 6. Justification for Atomic Number:
- The atomic number is defined as the number of protons in the nucleus.
- Counting the red circles (protons) confirms this.

#### 7. Mass Number and Calculation:
- The mass number is the sum of protons and neutrons.
- Protons = 8, Neutrons = 8.
- Mass number = 8 + 8 = 16.

#### 8. Electron Configuration (Number of Electrons per Shell):
- Electrons fill shells according to the Aufbau principle.
- The first shell can hold up to 2 electrons.
- The second shell can hold up to 8 electrons.
- Since there are 8 electrons total:
- First shell: 2 electrons
- Second shell: 6 electrons

#### 9. Group of the Element:
- Elements are grouped in the periodic table based on their valence electrons (electrons in the outermost shell).
- The element has 6 valence electrons (in the second shell).
- Elements with 6 valence electrons belong to Group 6 (or Group 16 in the modern periodic table).

#### 10. Name of the Group:
- Group 6 (or Group 16) is known as the Chalcogens.

#### 11. Identity of the Element:
- The element with atomic number 8 is Oxygen (O).

Final Answers:

1. How many protons are there in the nucleus?
8

2. Now many neutrons are in the nucleus?
8

3. How many electrons would this element have?
8

4. How did you work this out?
The number of electrons equals the number of protons in a neutral atom.

5. What is the atomic number of this element?
8

6. How do you know this?
The atomic number is equal to the number of protons.

7. What is the mass number? How did you work this out?
16 (Mass number = Protons + Neutrons = 8 + 8)

8. Put the correct number of electrons in each shell.
- First shell: 2 electrons
- Second shell: 6 electrons

9. What group does this element belong to?
Group 6 (or Group 16)

10. What name is given to this group?
Chalcogens

11. This element is:
Oxygen (O)

Final Answer:

\boxed{8, 8, 8, 8, 8, 16, 2 \text{ (first shell)}, 6 \text{ (second shell)}, 6, \text{Chalcogens}, \text{Oxygen}}