In one experiment a student placed 0.13 mL of a solution made from 0.299 g of unknown in 500.00 mL of pentane on a pan of water. After all the pentane evaporated a 26.03 cm2 monolayer of unknown remained on the surface of the water. If the density of the unknown was 0.761 g/mL what was the thickness of the monolayer in micrometers?

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explanation:

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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the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.