A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sounf ad gas bubbles were forming arounf it. Which conclusion is BEST supporter by this observation? A) Dissolved gases were released. B) A chemical change took place. C) Water was vaporized. D) The lithium was dissolved by the water.

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Explanation:

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error