Construction of dam : scarcity of water for animals
Chromium (Cr) is round in d block
A. Fission creates new elements from which electricity can be generated.
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Explanation:
The most reactive metals are found on the left of the periodic table, in the blue column, known as the alkali metals. Their reactivity increases as we go down column (group) one. Reactive metals, when attached to less reactive metals, have the ability to prevent the less reactive metal from rusting.