Grade 5 science worksheets - Free Printable

Problem Analysis:

The task involves using the word bank to label parts of an atom and answering questions about atomic structure. The word bank contains the following terms: electrons, protons, nucleus, neutrons.

Step-by-Step Solution:

#### 1. Labeling the Diagram:
The diagram shows a basic model of an atom with three labeled parts: A, B, and C. Based on the typical structure of an atom, we can identify these parts as follows:

- A: This is the central part of the atom, which is the nucleus.
- B: These are the particles orbiting the nucleus, which are electrons.
- C: These are the particles inside the nucleus, which include protons and neutrons.

So, the labels are:
- A: Nucleus
- B: Electrons
- C: Protons and Neutrons

#### 2. Answering the Questions:
Now, let's answer the questions based on the labeled diagram and the properties of atoms.

##### Question 1: What part of the atom contains no electric charge?
- Neutrons are neutral particles; they have no electric charge. Therefore, the part of the atom that contains no electric charge is the neutrons.

##### Question 2: What part of the atom has a positive electric charge?
- Protons are positively charged particles. Therefore, the part of the atom that has a positive electric charge is the protons.

##### Question 3: What part of the atom has a negative electric charge?
- Electrons are negatively charged particles. Therefore, the part of the atom that has a negative electric charge is the electrons.

##### Question 4: Where do most of the atom's mass come from?
- Most of the atom's mass comes from the protons and neutrons, which are located in the nucleus. Electrons contribute very little to the overall mass of the atom.

Final Answers:

1. What part of the atom contains no electric charge?
- Neutrons

2. What part of the atom has a positive electric charge?
- Protons

3. What part of the atom has a negative electric charge?
- Electrons

4. Where do most of the atom's mass come from?
- Protons and Neutrons

Boxed Final Answers:

\[
\boxed{
\begin{array}{l}
\text{1. Neutrons} \\
\text{2. Protons} \\
\text{3. Electrons} \\
\text{4. Protons and Neutrons}
\end{array}
}
\]