Question Detail

CHM 101 CHM 101 Past Questions Objective Question
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Question

What is the primary reason for the decrease in atomic radius across a period?
Options
A Increase in shielding effect
B Increase in nuclear charge
Correct Answer
C Decrease in number of electrons
D Increase in atomic number
Correct Answer

Option B is the correct answer.

Detailed Explanation

Across a period, electrons are added to the same principal energy level. The increasing nuclear charge (more protons) pulls the electron cloud closer to the nucleus, resulting in a smaller atomic radius.

Hint

The positive charge in the nucleus increases, pulling the electrons in more strongly.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 354 of 1872
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