Science worksheet for Grade 6 students focusing on elements, with fill-in-the-blank questions and references to textbook pages.

Here is the step-by-step solution to the homework activity.

Part I: What is an Element?

This section asks for the scientific definition of an element. Based on standard science textbooks (and the clue provided on page 107), we need to fill in the blanks to define what makes an element unique.

* Logic: An element is a pure substance. It is unique because it cannot be broken down into anything simpler using normal chemical methods.
* Filling the blanks:
* "An element is the simplest kind of..."
* "...matter which cannot be..."
* "...broken down into..."
* "...two or more..."
* "...simpler substances by..."
* "...ordinary chemical means."

Answer for I:
An element is the simplest kind of matter which cannot be broken down into two or more simpler substances by ordinary chemical means.

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Part II: Select the suitable answer

Here we fill in the blanks based on general science knowledge about elements and the periodic table.

1. \_\_\_\_\_\_ are made up of \_\_\_\_\_\_.
* Logic: In science, matter is made up of tiny particles called atoms. Since elements are types of matter, they are made of atoms.
* Answer: Matter (or Compounds) are made up of atoms. *Note: Given the context of "Elements", "Matter" is the most general fit.*

2. \_\_\_\_\_\_ is the most abundant \_\_\_\_\_\_ in earth's crust.
* Logic: The most common element in the Earth's crust (the outer layer) is Oxygen.
* Answer: Oxygen is the most abundant element in earth's crust.

3. Air consists of some \_\_\_\_\_\_ like \_\_\_\_\_\_ that every living thing use for breathing.
* Logic: Air is a mixture of gases. We need oxygen to breathe. Oxygen is an element.
* Answer: Air consists of some gases (or elements) like oxygen that every living thing use for breathing.

4. We can split an element into many simpler substances. \_\_\_\_\_\_.
* Logic: This is a True/False statement based on the definition in Part I. Elements *cannot* be split into simpler substances.
* Answer: False.

5. \_\_\_\_\_\_ is an element that is named after a scientist.
* Logic: There are several elements named after scientists (e.g., Einsteinium, Curium, Mendeleevium). A very common example used in schools is Einsteinium (named after Albert Einstein).
* Answer: Einsteinium (or Curium).

6. The classified chart of elements is called as \_\_\_\_\_\_.
* Logic: The famous chart that organizes all elements is the Periodic Table.
* Answer: The classified chart of elements is called as the Periodic Table.

7. Elements are arranged in the periodic table according to their \_\_\_\_\_\_.
* Logic: The primary way elements are ordered in the table is by their atomic number (number of protons).
* Answer: Elements are arranged in the periodic table according to their atomic number.

8. The elements in the periodic table are represented by a \_\_\_\_\_\_.
* Logic: Each element has a short code, usually 1 or 2 letters. This is called a symbol.
* Answer: The elements in the periodic table are represented by a symbol.

9. The symbol for hydrogen is \_\_\_\_\_\_ and sodium is \_\_\_\_\_\_.
* Logic: Hydrogen is H. Sodium is Na (from the Latin word *Natrium*).
* Answer: The symbol for hydrogen is H and sodium is Na.

10. Every element has a different \_\_\_\_\_\_ and \_\_\_\_\_\_.
* Logic: Elements are unique. They have unique names and unique symbols. They also have different atomic numbers and properties. Based on the context of the worksheet, "name" and "symbol" are the most likely answers.
* Answer: Every element has a different name and symbol.

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Final Answer:
I. What is an Element?
Ans: An element is the simplest kind of matter which cannot be broken down into two or more simpler substances by ordinary chemical means.

II. Fill in the blanks:
1. Matter are made up of atoms.
2. Oxygen is the most abundant element in earth's crust.
3. Air consists of some gases like oxygen that every living thing use for breathing.
4. We can split an element into many simpler substances. False.
5. Einsteinium is an element that is named after a scientist.
6. The classified chart of elements is called as the Periodic Table.
7. Elements are arranged in the periodic table according to their atomic number.
8. The elements in the periodic table are represented by a symbol.
9. The symbol for hydrogen is H and sodium is Na.
10. Every element has a different name and symbol.