Periodic Table Flash Cards - Free Printable PDF Element Facts - Free Printable

The image shows a set of periodic table flash cards for five elements: Lanthanum (La), Hydrogen (H), Calcium (Ca), Aluminum (Al), and Krypton (Kr). Each card contains essential information about the element, including its atomic number, symbol, name, and some classification details. Below is an explanation of each element based on the information provided:

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1. Lanthanum (La)

- Atomic Number: 57
- Symbol: La
- Classification: Lanthanide
- Atomic Mass: 138.905
- Category: Rare Earth Element

Explanation:
- Lanthanum is a silvery-white metal that belongs to the lanthanide series in the periodic table.
- It is classified as a rare earth element, which means it is part of the f-block elements.
- Its atomic mass is relatively high due to its position in the periodic table.

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2. Hydrogen (H)

- Atomic Number: 1
- Symbol: H
- Classification: Nonmetal
- Atomic Mass: 1.008
- Category: Lightest Element

Explanation:
- Hydrogen is the simplest and lightest element in the periodic table.
- It is a nonmetal and is often found as a diatomic molecule (H₂) in nature.
- Its atomic mass is very low because it has only one proton and no neutrons in its most common isotope.

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3. Calcium (Ca)

- Atomic Number: 20
- Symbol: Ca
- Classification: Alkaline Earth Metal
- Atomic Mass: 40.078
- Category: Reactive Metal

Explanation:
- Calcium is an alkaline earth metal, which means it belongs to Group 2 of the periodic table.
- It is highly reactive and is essential for biological processes, such as bone formation in humans.
- Its atomic mass is moderate compared to other elements shown here.

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4. Aluminum (Al)

- Atomic Number: 13
- Symbol: Al
- Classification: Basic Metal
- Atomic Mass: 26.98
- Category: Post-transition Metal

Explanation:
- Aluminum is a lightweight, silvery-white metal that is highly resistant to corrosion.
- It is classified as a basic metal or post-transition metal, meaning it does not belong to the transition metals but has some metallic properties.
- It is widely used in industries due to its strength and lightweight nature.

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5. Krypton (Kr)

- Atomic Number: 36
- Symbol: Kr
- Classification: Noble Gas
- Atomic Mass: 83.798
- Category: Inert Gas

Explanation:
- Krypton is a noble gas, which means it is part of Group 18 (the rightmost column) of the periodic table.
- Noble gases are generally unreactive because their outer electron shells are completely filled.
- Krypton is colorless, odorless, and used in lighting applications, such as fluorescent lamps and neon signs.

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Summary of Key Points:

1. Lanthanum (La): A lanthanide, rare earth element with atomic number 57.
2. Hydrogen (H): The lightest element, a nonmetal with atomic number 1.
3. Calcium (Ca): An alkaline earth metal with atomic number 20.
4. Aluminum (Al): A basic metal with atomic number 13, known for its lightweight and corrosion-resistant properties.
5. Krypton (Kr): A noble gas with atomic number 36, known for its inertness.

These flash cards provide a concise overview of each element's atomic number, symbol, classification, and atomic mass, making them useful tools for learning and memorizing periodic table facts.

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Final Answer:

\boxed{\text{The image shows flash cards for Lanthanum (La), Hydrogen (H), Calcium (Ca), Aluminum (Al), and Krypton (Kr), highlighting their atomic numbers, symbols, classifications, and atomic masses.}}