Which of the following provides evidence to support bohr's theory of atomic orbitals?
a. gold foil experiment
b. plum pudding model
c. spectrum of colors emitted by gas
d. radiation produced when beryllium is bombarded with alpha particles

C. Spectrum of colors emitted by gas

Explanation:

Neils Bohr model of atom suggested that orbital electrons are divided into spherical orbits or energy levels around the central nucleus. In essence, electrons are located at various energy levels round the nucleus. His concept explained the discrete lines in the atomic spectrum of hydrogen. He suggested that electrons can move between different energy levels by simply gaining or losing energy.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

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