• (a) What should be the valence of Be in its ground state (1s22s2)? (b) As discussed in Section 10.6, the 2s and 2p levels are close together, and when another atom is nearby, it is often energetically favorable to promote one of the 2s electrons to a 2p state, so that a bond can form. What is the valence of Be in the configuration 1s22s12p1?(c) Predict the chemical formulas for the compounds of Be with fluorine, with oxygen, and with nitrogen.
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