The correct order of atomic radius of Li, Na, Be and O is
”Na
”Na
”Be
”O
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC CDS-1 – 2024
– Li (Lithium), Be (Beryllium), and O (Oxygen) are all in Period 2. They have two electron shells.
– Comparing Na and Li: Na is below Li in Group 1, so Na > Li in atomic radius.
– Comparing Li, Be, and O: They are in Period 2. Moving from left to right, atomic radius decreases. So, Li > Be > O.
Combining these, the order from largest to smallest is Na > Li > Be > O.