Recall that a period is horizontal, and a group is vertical.
So if cobalt is moving "down" a period, it would be most logical to say that it would be Ni, or nickel. It could also be Copper, Zinc, Gallium, and so on. Make sense?
Answer:
2400 Joules
Explanation:
Work done = force × distance
work done= 600×4
Therefore, work done=2400joules
P.S: the SI unit for work done is JOULES
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