ionic bond----------two atoms optained stable electronic configuration by donating electron
eg. NaCl, Na donate一粒electron比Cl,變成Na+,相反Cl接左粒電子,變成Cl-,同時間兩邊既outermost electron都有八粒~
covalent bond---------two atoms obtain stable electronic configuration by sharing electron
eg. O2
d chem已經唔記得八八九九
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