The answer is B 1,500 meters since 1 kilometer to meters is 1,000 and u add the 500
When you say full valence shell, are you talking about a valence electron shell?
I am learning about atoms and i know a little bit
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30 + 6 = 36
36/12 = 3
So, it would take it 3 hours to go 12 kms downstream.
Note that we added 30 and 6 because it was going downstream. If it was going upstream, then we would have had to subtract.