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nonmetal oxides
free electron
ionic radius
retrocorrelation
free electron density
covalent compound
antibonding molecular orbital
bonding orbital
bond energy
pi bond
Non metallic elements
Non metallic elements
Non metallic elements
例句：
1
Main
contains
of
the
ash
include
metallic
elements
and
non-metallic
elements
as well
.
灰分
的
主要
成分
还
包括
金属元素
，
非
金属元素
。
2
It
refers
to
necessary
non-metallic
elements
.
指
必需
的
非金属
类型
元素
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Non metallic elementsNon metallic elementsNon metallic elements