Sectional test

Chemistry (Prelims GS) Test 3

• 25 questions
• 20 minutes
• +1 right · −0.25 wrong
• 0 students ranked

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First questions

1. Neutral Sulfur has 16 electrons. S⁺ means it lost 1 electron (16 - 1 = 15 electrons). C) 4018Ar+: Atomic number 18. Neutral Argon has 18 electrons. Ar⁺ means it lost 1 electron (18 - 1 = 17 electrons). D) 3516S2-: Atomic number 16. Neutral Sulfur has 16 electrons. S²⁻ means it gained 2 electrons (16 + 2 = 18 electrons). Therefore, 4018Ar+ has 17 electrons, the same number as neutral 3517Cl. These species are isoelectronic. 51. The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?
2. Which one of the following is the most fundamental characteristic of an element ?
3. Which one of the following ions is not iso- electronic with F⁻ ?