1)2FeCl2+Cl2=2FeCl3 (соединение)
2) без коэффициентов (соединения)
3)3Li2O+2H3PO4=2LiPO4+3H2O (реакция обмена)
4)WO3+3Н2=W+3H2O (замещение)
2Mg+O₂=2MgO
Mg+S=MgS
Mg+H₂SO₄=MgSO₄+H₂
Mg+2NaOH=Mg(OH)₂+2Na
Mg+Br₂=MgBr₂
3Mg+2FeCl₃=3MgCl₂+2Fe
<span>фосфор <span>1s</span></span>² <span><span>2s</span></span>²<span><span> 2p</span></span>⁶<span><span> 3s</span></span>²<span><span> 3p</span></span>³<span><span><span>
</span></span></span><span>фтор <span>1s</span></span>² <span><span>2s</span></span>² <span><span>2p</span></span>⁵<span><span><span>
</span></span></span><span>аргон <span>1s</span></span>²<span><span> 2s</span></span>²<span><span> 2p</span></span>⁶<span><span> 3s</span></span>²<span><span> 3p</span></span>⁶<span><span><span>
</span></span></span><span>алюминий <span>1s</span></span>²<span><span> 2s</span></span>²<span><span> 2p</span></span>⁶<span><span> 3s</span></span>²<span><span> 3p</span></span>¹<span><span><span>
</span></span></span><span>сера <span>1s</span></span>²<span><span> 2s</span></span>²<span><span> 2p</span></span>⁶<span><span> 3s</span></span>²<span><span> 3p</span></span>⁴<span><span><span>
</span></span></span><span>калий <span>1s</span></span>²<span><span> 2s</span></span>²<span><span> 2p</span></span>⁶<span><span> 3s</span></span>²<span><span> 3p</span></span>⁶ <span><span>4s</span></span>¹
