Two or more waves combining to produce a wave with a smaller displacement is called

Destructive interference

Explanation:
Interference is a term used to refer to the combination of two waves or their overlap
There are two types of interference:
1- Constructive interference: This happens when the waves overlap/combine to produce a resultant wave with a larger displacement
2- Destructive interference: This happens when the waves overlap/combine to produce a resultant wave with a smaller displacement

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Molybdeum(mo)orruthenium (ru)actually, elements with similar chemical properties as technetium would bemn, re, and bh. this is because elements in the same group/family (column) have similar chemical properties. elements in the same period (row) have the same number of energy levels (or shells).