MCQ practice · SSC Chemistry Board questions · Chapter 5: Chemical Bond
How many valence electrons does element Y have?
Think it through first, then pick an option.
- a 1
- b 5
- c 7
- d 17
Answer and explanation
Correct answer: c 7
Y (17) is 2, 8, 7; its last orbit holds 7 electrons.
Why the other options are wrong
- a 1: One valence electron belongs to metals like Na or K; Y (17) is 2, 8, 7.
- b 5: Five belongs to P (15); Y (17) has 7 in its last orbit.
- d 17: 17 is the atomic number, the total electrons; only the 7 in the last orbit are valence electrons.
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