Question
The number of valence electrons found in an atom of a Group A element is equal to its atomic number. its group number. eight. its mass number. eight minus the group number.
Ask by Bob Harmon. in the United States
Jan 28,2025
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Tutor-Verified Answer
Answer
The number of valence electrons in a Group A element is equal to its group number.
Solution
The number of **valence electrons** in an atom of a Group A element is directly related to its group number in the periodic table. Here's a breakdown:
- **Group 1A (1)**: 1 valence electron
- **Group 2A (2)**: 2 valence electrons
- ...
- **Group 8A (18)**: 8 valence electrons (except for some variations in the noble gases)
For main group elements (s- and p-block elements), the number of valence electrons corresponds precisely to the group number. This relationship helps determine the chemical properties and reactivity of the elements within that group.
**Correct Answer:**
**Its group number.**
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Simplify this solution Beyond the Answer
The number of valence electrons for Group A elements corresponds to their group number. For instance, elements in Group 1 have one valence electron, while those in Group 2 have two. This pattern continues up through Group 8, where noble gases have eight valence electrons, making them stable and unreactive. In practical terms, knowing the number of valence electrons helps predict how an element will bond with others. For example, elements with one or two valence electrons tend to lose them to achieve stability, while those with six or seven often gain or share electrons. This foundational knowledge is crucial in fields like chemistry and materials science!
