Questions and Answers
Which group in the periodic table has 2 valence electrons?
What are some examples of elements from Group 2?
Beryllium, Magnesium, Calcium, Radium
What is the valence electron count for Group 13?
3 valence electrons
Which of the following is an example of an alkali metal?
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List three examples of alkaline-earth metals.
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What defines transition metals?
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What are the elements in the lanthanide series?
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Which group contains nonmetals with 7 valence electrons?
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What is distinctive about Group 18 elements?
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What is an example of a noble gas?
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The ______ is associated with alkali metals because it has only 1 valence electron.
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What is the definition of a group number in the periodic table?
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Study Notes
Group 2: Alkaline-Earth Metals
- Elements have 2 valence electrons, indicating reactivity.
- Examples include Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.
- Less reactive than alkali metals (Group 1).
Group 13
- Elements possess 3 valence electrons, deducing the "1" in double-digit group numbers.
- Aluminum is a key example.
- 3rd ionization energy represents energy required to remove a third electron from a cation, with a value of 6913 kJ/mol for Na2+.
Group 1: Alkali Metals
- Characterized by having 1 valence electron, resulting in high reactivity.
- Includes Lithium, Sodium, and Potassium.
Group 3-12: Transition Metals
- Properties of these metals vary widely but retain metallic characteristics.
- Common examples are Iron, Gold, Zinc, Silver, and Copper.
Lanthanides and Actinides Series
- Located in two rows at the bottom of the periodic table, comprising transition metals from periods 6 and 7.
- The top row, the Lanthanide series, includes elements from Lanthanum (atomic number 57) to Lutetium (atomic number 71).
- Examples include Neodymium, Thorium, and Europium.
Group 17: Halogens
- Composed of nonmetals with 7 valence electrons.
- Notable elements include Fluorine, Chlorine, Bromine, Iodine, and Astatine.
Group 18: Noble Gases
- Unreactive nonmetals with a complete outer electron shell containing 8 electrons.
- Examples include Helium, Neon, Argon, Krypton, Xenon, and Radon.
- Helium is notable for its small size, and is commonly used to fill balloons for floating.
Hydrogen
- Though associated with alkali metals due to having 1 valence electron, Hydrogen is nonmetallic and very reactive.
- Has only one electron level, making it unique compared to alkali metals.
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Description
Test your knowledge with these flashcards focusing on Group 2 of the Periodic Table. Each card includes a definition and examples of elements with two valence electrons. Perfect for chemistry students looking to reinforce their understanding of this element group.
