The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements? a.) Atomic radii increase from left to right across a period and decrease from top to bottom in a group. b.) Atomic radii increase from left to right across a period and increase from top to bottom in a group. c.) Atomic radii decrease from left to right across a period and decrease from top to bottom in a group. d.) Atomic radii decrease from left to right across a period and increase from top to bottom in a group.

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Rutherford's scattering experiment

Rutherford’s scattering experiment is also known as the gold foil experiment. This experiment disproved the plum pudding model of J.J. Thomson. In a gold foil experiment, high-energy alpha particles are made to strike a thin gold foil. The scattered alpha particles are detected using a detector. This experiment showed that the positive charge of the atom is at the center. Most of the atom’s mass is also confined to a small volume at the center. This region is known as the nucleus of the atom.