15: 1s²2s²2p⁶3s²3p³ P có 5 e hóa trị cần thêm 3 e để đạt octet

1: 1s^{1  H có 1 e hóa trị cần 1 e đẻ đạt octet}

^{khi hình thành liên kết,P góp chung 3 e với 3 e của 3 H => trong PH₃ xung quanh P có 8 e giống khí hiếm Ar còn 3 H đều có 3 e giống khí hiếm He}

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