Question

which of the following species has the same number of electrons as cl⁻?
answer:
a s²⁻
b br⁻
c f⁻
d p³⁺
e k⁻

Explanation:

Step1: Determine electrons in Cl⁻

Chlorine (Cl) has atomic number 17. Cl⁻ has 17 + 1=18 electrons.

Step2: Analyze electrons in each option

• Option A: Sulfur (S) has atomic number 16. S²⁻ has 16 + 2 = 18 electrons.
• Option B: Bromine (Br) has atomic number 35. Br⁻ has 35+ 1 = 36 electrons.
• Option C: Fluorine (F) has atomic number 9. F⁻ has 9 + 1=10 electrons.
• Option D: Phosphorus (P) has atomic number 15. P³⁺ has 15 - 3 = 12 electrons.
• Option E: Potassium (K) has atomic number 19. K⁻ is not a common ion, but if considered, it would have 19+1 = 20 electrons.

Answer:

A. S²⁻