All of the following statements about lst ionization energy of elements are correct EXCEPT:
Correct answer: D. Ne > He
- A. O > N
- B. Be > B
- C. Al > Mg
- D. Ne > He
Explanation
The correct answer is Option D: Ne > He. This statement is incorrect because helium has a higher first ionization energy than neon. The ionization energy generally increases across a period, but helium, being a noble gas with a smaller atomic radius, holds its electrons more tightly than neon. The other options describe correct trends: Option A is incorrect because nitrogen has a higher ionization energy than oxygen due to half-filled p orbital stability, Option B is correct because beryllium's filled 2s orbital gives it higher ionization energy than boron, and Option C is incorrect because magnesium has a higher ionization energy than aluminum due to its filled 3s orbital.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Periodic Properties and Trends questions
Mark the incorrect statement about the period and group in the modern periodic table:
Which of the following group of elements have positive 1st electron affinity?
The ionization energy of an element is:
Correct order of decreasing electron affinities of group VII is:
The enthalpy change accompanying the gain of an electron by a neutral gaseous atom to form a negative ion is called:
Which statement is correct: