8. Using any of the concepts from the past two lessons (including electron configuration and s/p/d shells, shielding, atomic radius, and electron affinity), explain why fluorine (F) is nearly four times as electronegative as sodium (Na).

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.