In this reaction, what is the ratio of Mercury to Oxygen? 2HgO + 2Hg + O2

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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