Which of the following elements has 3 valence electrons?

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BlackTom AI · Accepted Answer

The question asks which element has 3 valence electrons. Valence electrons are typically the electrons in the outermost shell and align with the element’s group number for main-group elements. Aluminum (Al) is in group 13 (IIIA) of the periodic table, and its conventional valence electron count is 3, corresponding to its outermost 3s2 3p1 configuration in the third energy level.

If we consider how valence electrons are counted across the periodic table:
- Elements in group 1 have 1 valence electron, group 2 have 2, group 13 have 3, group 14 have 4, and so on, for the representative elements. This pattern supports the idea that Al has 3 valence electrons.

However, the provided options list is empty, which means there are no alternative choices to compare. In a typical multiple-choice setup, you would evaluate each option against the rule above and the known electron configurations. For example, a correct option would be 'Al' or another element with 3 valence electrons such as boron (B) in a strict group-13 context; but note that boron also has 3 valence electrons and is in group 13, while aluminum is element 13 and also has 3 valence electrons.

In contrast, any option proposing elements from groups with 1, 2, or 4 (like H or Li with 1, Be or Mg with 2, or C or Si with 4) would be incorrect because their typical valence electron counts differ from 3. If an option suggested a transition or inner-transition metal or an ionized state, that would complicate the count, since valence electrons refer to the neutral, outermost-electron configuration in the standard teaching context.

Since no answer choices are present to critique individually, the core concept remains: aluminum (Al) has 3 valence electrons in its common, neutral state, corresponding to its placement in group 13. Any option matching Al would be correct under the standard interpretation; any option claiming a different group or a different electron-count principle would be misaligned with the conventional valence-electron model.

Pre-AP CHEM S1 Final - P2

Which of the following elements has 3 valence electrons?

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