1.What is the element of 1s² 2s² 2p6 3s² 3p6 4s² ?
2.What is the Atomic Number of 1s² 2s² 2p6 3s² 3p6 4s² 3d10 4p6 5s² ?
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1.What is the element of 1s² 2s² 2p6 3s² 3p6 4s² ?
2.What is the Atomic Number of 1s² 2s² 2p6 3s² 3p6 4s² 3d10 4p6 5s² ?
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Why it seems so hard? naman