1. How are elements arranged in the modern periodic table?

2. Name the three broad classes of elements?

3. Identify each element as a metal, a metalloid, and non-metal.

Gold (Au) B. sulfur (S) C. silicon (Si) D. Barium (Ba)

4. Based on the following electron configurations. Identify each element as a representative element, transition metal, or noble gas. Identify the valence of each one of them?

A. 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶

B. 1s²2s²2p⁶3s²3p⁶3d⁶4s²

C. 1s²2s²2p⁶3s²3p²

5. Using the figure below, write the electron configuration of the following

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