The ionization energy of hydrogen atom is x kj. the energy required for an electron to jump from 2nd orbit to the 3rd orbit will

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the answer is d, it has indefinite shape but definite volume.

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answersilicon (si); oxygen (o);

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.