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can u help me on these questions?

1) describe the development of the modern periodic table. include contributions made by Lavoiser, Newlands, Mendeleev, and Mosely.

2) describe the general characteristics of metals, nonmetals, and metalloids.

3) identify each of the fallowing as a representative element or a transition element.
(a) lithium---Li
(b) platinum---Pt
(c) promethium---Pm
(d) carbon---C

much help is needed and appriciated

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