Which of the following statements is not correct?
Correct answer: D. In the second period, as we move from left to right, ionization energy increases regularly.
- A. The element with the highest ionization energy (IE) belongs to group 18.
- B. In each period, the element with the lowest ionization energy belongs to group 1.
- C. In each period, the element with the highest ionization energy is a noble gas.
- D. In the second period, as we move from left to right, ionization energy increases regularly.
Explanation
The correct answer is Option D. While moving across a period from left to right, the general trend is an increase in ionization energy due to increasing nuclear charge attracting electrons more strongly. However, there are exceptions in the second period, particularly between nitrogen and oxygen, where the expected increase does not occur regularly due to the electron configuration and repulsion factors. Option A is correct because noble gases have high ionization energies. Option B is correct as alkali metals in group 1 have the lowest ionization energies in each period. Option C is also correct because noble gases typically have the highest ionization energies in a period.
Last updated
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.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
2. Law of octaves was proposed by
7th period of the periodic table contains normal elements:
(A), (B) and (C) are elements in the third period. The oxide of(A) is ionic, that of (B) is amphoteric and that of (C) is a giant molecule (covalent network). (A), (B) and (C) have atomic numbers in the order:
(A), (B) and (C) are elements in the third short period. Oxide of (A) is ionic, that of (B) is amphoteric and of (C) a giant molecule. (A), (B) and (C) have atomic numbers in the order of:
A gas that reacts with CaO and not with NaHCO3 is: