The atomic radii of elements in the middle of the 3d series (, , ) remain almost constant. What is t — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Atomic size depends on the balance between Effective Nuclear Charge (pulling inward) and shielding/repulsion (pushing outward). In the middle of the series, the inward pull of added protons is cancelled by the outward push of the added $3d$ electrons.