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As the ionization energies of the elements decreases down the group carbon has got the highest ionization energy in the group being at the top of the group.

Carbon is on the top of the group 4 among the given elements. Hence, Carbon has the highest ionization energy.

There’s no doubt that working in retail you will encounter an unhappy, disgruntled, or difficult customer.  Learning to hold in your personal feelings, addressing empathy for customers, and representing the company well in order to keep customers coming back are all important skills recruiters will look for when assessing how you deal with uncomfortable situations.

Sober means not afected by alcohol, clear headed, very serious, sensible,...

Antonyms of Sober are :: light hearted, frivolous, sensational, emotional,...

Optical illusion is what that refers to persistence of vision with a principle that multiple images blend into a single image in human mind and what is showed in cinema.

Hence, Persistence of vision is the principle behind cinema.