Educational worksheet on elements and atoms for middle school science.

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You’ve pasted the full text of a “Cross-Curricular Review: Physical Science” worksheet titled “Elements & Atoms”, which includes five questions based on a short reading passage about elements and atoms.

Here’s how to solve each question with clear explanations:

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Question 1: Which is larger: an atom or an element? Explain.

✔ Answer:
An element is larger than an atom — but not in physical size. An *element* is a category or type of substance made up of many identical *atoms*. So, while a single atom is the smallest unit of an element, an element (as we think of it in chemistry) refers to a collection of those atoms.

➡️ Explanation:
Think of it like this:
- An atom = one tiny particle (like one Lego brick).
- An element = all the Lego bricks of the same color/type (e.g., all red bricks).
So, “element” refers to the group, not the individual piece. In that sense, an element is “larger” because it contains many atoms.

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Question 2: What is the purpose of the periodic table?

✔ Answer:
The periodic table organizes all known chemical elements based on their atomic number, electron configuration, and recurring chemical properties. It helps scientists predict how elements will behave and react with each other.

➡️ Explanation:
It’s like a giant chart that groups similar elements together (e.g., metals, nonmetals, semimetals). Each box tells you the element’s name, symbol, atomic number, and often its atomic mass. This organization makes it easier to study patterns — for example, elements in the same column (group) have similar chemical behaviors.

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Question 3: How many different elements do we know about?

✔ Answer:
We know about more than 100 different elements.

➡️ Explanation:
As of now (2024), there are 118 confirmed elements on the periodic table. The passage says “more than 100,” which is accurate. Some are naturally occurring; others are human-made in labs.

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Question 4: What is included in the box for each element?

✔ Answer:
Each box in the periodic table includes:
- The element’s name
- Its chemical symbol (usually 1–2 letters)
- Its atomic number (number of protons)
- Often its atomic mass (average mass of its atoms)

➡️ Explanation:
For example, the box for Sodium (Na) shows:
- Name: Sodium
- Symbol: Na
- Atomic Number: 11
- Atomic Mass: ~22.99

These details help identify and classify the element quickly.

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Question 5: What is a semimetal?

✔ Answer:
A semimetal (also called a metalloid) is an element that has properties of both metals and nonmetals.

➡️ Explanation:
Examples include silicon, germanium, and arsenic. They may conduct electricity under certain conditions (like metals) but are brittle (like nonmetals). Semimetals are often used in electronics — for example, silicon is used to make computer chips.

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## ✔ Final Summary Answers:

1. An element is “larger” because it’s a category containing many atoms of the same type.
2. The periodic table organizes elements by atomic number and properties to help predict behavior.
3. More than 100 elements are known (currently 118).
4. Each box includes: name, symbol, atomic number, and atomic mass.
5. A semimetal has properties of both metals and nonmetals.

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