Question detail
How does the first ionisation energy change across Period 3?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Periodicity
Question
- A. Increases
- B. Decreases
- C. Remains constant
- D. Fluctuates
Answer
Increases
Explanation
The first ionisation energy increases across Period 3 due to the increasing nuclear charge, which makes it more difficult to remove an electron from the outer shell.
Common mistake
Misunderstanding Block Classification
Students often confuse the block classification of elements with their position in the periodic table, failing to link it to the electron configuration.
To correctly classify elements, remember that the block (s, p, d, f) corresponds to the highest energy sublevel that is being filled. For example, elements in the s block have their outermost electrons in the s sublevel. Use the periodic table to identify the block and then write the electron configuration to confirm.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.