Physical Science - Worksheet on Periodic Table of Elements - Matter #7 - Free Printable

The worksheet you've uploaded is focused on the periodic table and its elements. The task involves identifying elements based on specific criteria or properties. Below, I will explain how to solve each part of the worksheet.

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Worksheet #7: Matter

#### Instructions:
From the periodic table, name elements that fit the given descriptions.

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1. From the periodic table name 3 alkaline metals:

- Alkaline metals are elements in Group 1 of the periodic table (excluding hydrogen). They are highly reactive metals.
- Examples: Lithium (Li), Sodium (Na), Potassium (K).

Answer:
1. Lithium (Li)
2. Sodium (Na)
3. Potassium (K)

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2. From the periodic table name 3 transition metals:

- Transition metals are elements in Groups 3–12 of the periodic table. They are characterized by their ability to form multiple oxidation states and often have metallic properties.
- Examples: Iron (Fe), Copper (Cu), Zinc (Zn).

Answer:
1. Iron (Fe)
2. Copper (Cu)
3. Zinc (Zn)

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3. From the periodic table name 3 noble gases:

- Noble gases are elements in Group 18 of the periodic table. They are generally unreactive due to having a full outer electron shell.
- Examples: Helium (He), Neon (Ne), Argon (Ar).

Answer:
1. Helium (He)
2. Neon (Ne)
3. Argon (Ar)

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4. From the periodic table name 3 lanthanide series elements:

- Lanthanides are a group of 15 elements with atomic numbers 57–71, located in the f-block of the periodic table. They are also known as rare earth elements.
- Examples: Cerium (Ce), Praseodymium (Pr), Neodymium (Nd).

Answer:
1. Cerium (Ce)
2. Praseodymium (Pr)
3. Neodymium (Nd)

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5. From the periodic table name 3 actinide series elements:

- Actinides are a group of 15 elements with atomic numbers 89–103, located in the f-block of the periodic table. They are radioactive and include uranium and plutonium.
- Examples: Thorium (Th), Uranium (U), Plutonium (Pu).

Answer:
1. Thorium (Th)
2. Uranium (U)
3. Plutonium (Pu)

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6. From the periodic table name the only two liquid elements at room temperature:

- At room temperature (approximately 25°C), only two elements exist as liquids:
- Mercury (Hg): A metal in Group 12.
- Bromine (Br): A halogen in Group 17.

Answer:
1. Mercury (Hg)
2. Bromine (Br)

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7. From the periodic table name 3 diatomic gases:

- Diatomic gases are elements that naturally occur as molecules consisting of two atoms bonded together.
- Examples: Hydrogen (H₂), Oxygen (O₂), Nitrogen (N₂).

Answer:
1. Hydrogen (H₂)
2. Oxygen (O₂)
3. Nitrogen (N₂)

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8. From the periodic table name 3 nonmetals:

- Nonmetals are elements that do not exhibit metallic properties. They are typically poor conductors of heat and electricity.
- Examples: Carbon (C), Phosphorus (P), Sulfur (S).

Answer:
1. Carbon (C)
2. Phosphorus (P)
3. Sulfur (S)

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Final Answer:

1. Alkaline metals: Lithium (Li), Sodium (Na), Potassium (K).
2. Transition metals: Iron (Fe), Copper (Cu), Zinc (Zn).
3. Noble gases: Helium (He), Neon (Ne), Argon (Ar).
4. Lanthanide series elements: Cerium (Ce), Praseodymium (Pr), Neodymium (Nd).
5. Actinide series elements: Thorium (Th), Uranium (U), Plutonium (Pu).
6. Liquid elements: Mercury (Hg), Bromine (Br).
7. Diatomic gases: Hydrogen (H₂), Oxygen (O₂), Nitrogen (N₂).
8. Nonmetals: Carbon (C), Phosphorus (P), Sulfur (S).

Boxed Final Answer:
\[
\boxed{
\begin{array}{l}
\text{1. Lithium (Li), Sodium (Na), Potassium (K)} \\
\text{2. Iron (Fe), Copper (Cu), Zinc (Zn)} \\
\text{3. Helium (He), Neon (Ne), Argon (Ar)} \\
\text{4. Cerium (Ce), Praseodymium (Pr), Neodymium (Nd)} \\
\text{5. Thorium (Th), Uranium (U), Plutonium (Pu)} \\
\text{6. Mercury (Hg), Bromine (Br)} \\
\text{7. Hydrogen (H₂), Oxygen (O₂), Nitrogen (N₂)} \\
\text{8. Carbon (C), Phosphorus (P), Sulfur (S)}
\end{array}
}
\]