20點!! Ionic & covalent bonding

Ionic bond or Covalent bond 要睇番不同element既electronegativity difference. 通常大既會係IONIC(transfer of electron), 細既就係 COVALENT(share of electron).

無話 metal and metalloid 就係 邊一種bond, 一定要睇番隻element既特性.

例如Fe會form唔同既bond, haemoglobin既Iron 係 5~6 coordinated, FeCl2 就係ionic.

例如Si通常會係covalent bond

Metal Metal既就通常係Metallic Bond, 但都要睇番係D咩Metal, 係element定compound.

總括來說, 化學不能一概而論

好同意其他人所講
其實唔可以一概而論

ionic bonding

舉例
其實有
Cl-Be-Cl
尼個BeCl2
e個就係covalent來的

而Metal + non-metal之中
NH4+ 又可以代左metal個位佢

簡單而言 其實好難講 不過大多數
Metal cation / Ammonium ion + non-metal ion 好多時都會係ionic

covalent真係咩q都有== 唔可以解到x+x->covalent咁
例如上面BeCl2
例如有SiO2
例如有Carbon only forming graphite/diamond 咁 仲有silicon forming a network

總括尼講 要讀既野主要全nm+nm/sm+nm

O2XeF6 , an ionic compound that is just weird.
metal + non-metal: how about chlorophyll, tetraethyl lead, methyl mercury, haemoglobin, CaEdta?

我清楚地解釋下先.
ionic bonding - anion + cation
唔一定係有metal
e.g. NH4NO3 ammonium nitrate
covalent bonding 基本冇錯.

全metal 既一定係叫做metallic bonding.
有non-metal + metal 可以係metallic bonding
such as steel = carbon + iron,
但都有係ionic
metaloid + metaloid 一定係covalent
non-metal + metalloid --> covalent

hope helpful