Magnesium (Mg) has nine electrons. Which of the following shows the correct electron configuration for an atom of Mg? 2, 2, 5
7, 2
1, 8
2, 7

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Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?