Atoms, which contain 1, 2, or 3 electrons in their valence shells, show metallic characteristics

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1. Atoms, which contain 1, 2, or 3 electrons in their valence shells, show metallic characteristics. Why do the metals of group 1 and 2 differ from transition metals, which also contain 1 or 2 electrons in the outermost shell? Support your answer with at least two examples.

2. How does an orbital defined by the quantum mechanical model differ from the orbit described by Bohr? Give at least four points

3. Complete the electronic configuration of the following: a.Fluorine (Atomic Number: 9): 1s2 2s2 _____ b.Potassium (Atomic Number: 19): 1s2 2s2 2p6__ __ __

4.Which of the following elements have an equal number of valence electrons? a.Na (Atomic Number: 11) b.O (Atomic Number: 8) c.K (Atomic Number: 19)

5. Write the number of valence electrons and valency of aluminium (Atomic Number: 13).

6. The electronic configuration of the atoms of three elements X, Y, and Z is given below. Which of these elements are metals? a: 1s2 2s1 b: 1s2 2s2 2p5 c: 1s2 2s2 2p6 3s2

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