alleryAtomic radius generally DECREASES across a period because:
ANumber of shells decreases
BNuclear charge increases while shell number stays the same
CAtomic mass decreases by common convention
DNumber of neutrons rises
Answer & Solution
Correct answer: B. Nuclear charge increases while shell number stays the same
1. Across a period each new element adds one proton.
2. The added electron enters the same outer shell.
3. Greater nuclear charge pulls the outer shell inward.
4. Atomic radius therefore shrinks left to right.
5. The shell number does not change within a period.
_Source: syllabus Science Ch 5 'Periodic Classification of Elements'_
Keep practising Periodic Classification of Elements
Browse all Periodic Classification of Elements questions for Andhra Pradesh SSC (Class 10), or explore more Science topics.
Related questions
Which of the following set of elements is written in order of their increasing metallic chOn moving from left to right in a period in the periodic table, the size of the atom.Which one of the following does not increase while moving down the group of the periodic tWhich of the following elements will form an acidic oxide?Three elements B, Si and Ge areWhat type of oxide would Eka-aluminium form?Arrange the following elements in the order of their increasing non-metallic character Li,Arrange the following elements in the order of their decreasing metallic character Na, Si,