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I believe its Boron.1s2 2s2 2p1 --> 5 electrons. Boron is atomic number 5, so 5 protons and 5 electrons balance. Look at the Periodic Table. The first row (period) corresponds to the first level of electron shell (1s). The second row corresponds to the second shell (2s & 2p). Shell 2s is Lithium and Beryllium on the far left, then 2p for the groups (columns) on the right hand side. It 'jumps' with a gap, because lower shells fill up faster (2p has a maximum of 6 electrons, which when full is Neon - a noble gas will a full shell)
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14y ago

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