質(zhì)子,中子,電子...有什么關(guān)系?
化學(xué)知識(shí)忘沒(méi)了.
搞清它們關(guān)系了應(yīng)該就能選出來(lái)了.這不是選擇題那你要問(wèn)什么啊??問(wèn)題解決了沒(méi)?
if a proton has a relative mass of 1 unit and a relative charge of +1 unit .what is the
if a proton has a relative mass of 1 unit and a relative charge of +1 unit .what is the
接上relative mass and charge of :1.a neutron
2.an electron?
接上relative mass and charge of :1.a neutron
2.an electron?
其他人氣：323 ℃時(shí)間：2020-06-24 01:08:03
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