Boeing aircraft manufacturing corporation use rivets that are made of an aluminum alloy containing 5.4% Cu, then are heated to 500 degrees Celsius and quenched in water to become soft. They are kept in boxes cooled by liquid nitrogen. Finally, they are taken and promptly used when needed. Explain why Boeing engineers follow such procedure.

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sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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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.

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