GK QUESTION#3289
Consider the following statements about periodic properties of elements:
1. First ionisation energy generally decreases as the atomic radius increases within a group.
2. Electronegativity and ionisation energy generally increase across a period from left to right.
3. Atomic mass is directly related to the ionisation energy of an element.
Which of the above statements is/are correct?
Show Answer
Answer
A. Only 1 and 2
Show Explanation
Explanation
First ionisation energy generally falls down a group as the outer electron becomes more distant and more shielded. Across a period, ionisation energy and electronegativity generally increase, with exceptions. Atomic mass does not directly determine ionisation energy; electronic structure and effective nuclear attraction matter. Only statements 1 and 2 are correct.