B. The electron in a hydrogen atom can undergo a transition from n = 6 ton = 1, emitting a photon with energy 2.11 x 10-18 J.

i. What is the frequency of this transition?

ii. How does this transition show that the energy of a phonto is quantized?

the answer is the first option

explanation:

just googled it m8. not that hard

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the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

increased stability in the completion of fluorine's outer shell.