The electronic configuration of the atoms of three elements X, Y, and Z is given below. Which of these elements are metals?

The electronic configuration of the atoms of three elements X, Y, and Z is given below. Which of these elements are metals?
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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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