Compounds containing iron, palladium, platinum, and the rare-earth elements exhibit strong paramagnetism because they have atoms with some incomplete inner electron shells.
含有铁、钯、铂和稀土元素的化合物呈现强顺磁性，因为这些元素的原子有不完全的内电子壳层。
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This paper analyzes shell electron pair repulsion theory , valence-bond theory and molecular orbital theory on molecular structure of noble gas compounds.