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Which of the following is noble gas 1.1s2 2s2 2p62.1s2 2s2 2p6 3s2 3p43.1s2 2s2 2p6 3s2 3p6 3d5 4s24.1s2.2s2 2p6 3s1 |
| Answer» ANS: AEXPLANATION:outer SHELL have fullfilled electrons NEON is a noble gas | |