Question

The order of increasing atomic radius of Be, C, F, and Ne is: Ne < F < C < Be

• A. True
• B. False

Answer 1

The correct option is B False

1. An atomic radius is half the distance between adjacent atoms of the same element in a molecule.
2. In general, the atomic radius decreases across a period because as electron shielding remains constant over time, effective nuclear charge increases. A higher effective nuclear charge attracts electrons more strongly, drawing the electron cloud closer to the nucleus and resulting in a smaller atomic radius.
3. Atomic radius increases down a group because down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.
4. Group number of elements: Be - 2, C - 14, F - 17, Ne - 18
5. So the expected order, Be>C>F>Ne
6. But Ne is a noble gas and it has vanderwaals radii which are greater than covalent radii
7. So the correct order will be Ne > F < C < Be

Hence the statement is false.