Multiple choice general knowledge science & technology

How many electrons are found in the outermost shell of aluminum (Al, atomic number 13)?

  1. 2

  2. 3

  3. 5

  4. 8
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B Correct answer
Explanation

Aluminum (Al) has atomic number 13, meaning it has 13 electrons. These are arranged in shells: 2 in the first shell, 8 in the second shell, and 3 in the outermost shell. The outermost shell is the valence shell, so aluminum has 3 valence electrons. This explains why aluminum commonly forms compounds with a +3 oxidation state.

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