Atoms, Elements, Compounds Worksheets - Free Printable

Problem Analysis:

The task involves labeling the parts of an atom, explaining the role of each part, and identifying the element depicted in the image. Let's break it down step by step.

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Part A: Label the Parts of the Atom

The diagram shows a basic model of an atom with labeled parts. Here are the labels for each part:

1. Proton: Located in the nucleus (center) of the atom. Protons are positively charged particles.
2. Neutron: Also located in the nucleus (center) of the atom. Neutrons are neutral particles (no charge).
3. Electron: Found in the electron shells/orbits around the nucleus. Electrons are negatively charged particles.
4. Nucleus: The central part of the atom containing protons and neutrons.
5. Electron Shells/Orbits: The regions around the nucleus where electrons are found.

#### Correct Labels:
- Top left: Proton
- Bottom left: Neutron
- Right: Electron
- Center: Nucleus
- Outer dashed circle: Electron Shells

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Part B: Explain the Role of All These Parts

Now, we need to explain the role of each part of the atom:

1. Proton:
- Role: Protons are positively charged particles located in the nucleus. They determine the atomic number of an element, which identifies the element itself. The number of protons equals the number of electrons in a neutral atom, ensuring electrical neutrality.

2. Neutron:
- Role: Neutrons are neutral particles located in the nucleus. They contribute to the mass of the atom but do not affect its chemical properties. Together with protons, they form the nucleus and provide stability through nuclear forces.

3. Electron:
- Role: Electrons are negatively charged particles that orbit the nucleus in specific energy levels or shells. They are responsible for chemical bonding and interactions between atoms. The arrangement of electrons determines the chemical behavior of an element.

4. Nucleus:
- Role: The nucleus is the central part of the atom, containing protons and neutrons. It is the densest part of the atom and holds almost all the mass. The nucleus is held together by the strong nuclear force, which overcomes the repulsive electrostatic force between protons.

5. Electron Shells/Orbits:
- Role: Electron shells are the regions around the nucleus where electrons are found. Electrons occupy these shells according to specific rules (e.g., the Pauli exclusion principle and the Aufbau principle). The outermost shell (valence shell) determines the chemical reactivity of the atom.

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Part C: What Element Does This Atom Depict?

To identify the element, we need to count the number of protons and electrons in the diagram:

- From the diagram, there are 2 protons in the nucleus.
- There are also 2 electrons orbiting the nucleus.

Since the number of protons equals the number of electrons, the atom is electrically neutral. The atomic number (number of protons) is 2, which corresponds to the element Helium (He).

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Final Answer:

#### Part A: Labels
- Top left: Proton
- Bottom left: Neutron
- Right: Electron
- Center: Nucleus
- Outer dashed circle: Electron Shells

#### Part B: Roles
1. Proton: Positively charged particle in the nucleus; determines the atomic number.
2. Neutron: Neutral particle in the nucleus; contributes to atomic mass.
3. Electron: Negatively charged particle in orbits/shells; responsible for chemical bonding.
4. Nucleus: Central part containing protons and neutrons; holds most of the atom's mass.
5. Electron Shells/Orbits: Regions around the nucleus where electrons are found; determine chemical behavior.

#### Part C: Element
The atom depicts Helium (He).

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Final Answer Boxed:

\[
\boxed{\text{Helium (He)}}
\]