Một người nông dân sử dụng 2kg phân bón (NH4)2 HPO4 để bón cây .Tính khối lượng đạm (N) và photpho (P2O5) đã bón cho cây

And a) oxygen i believe

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

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