cations

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204929947
Posts: 76
Joined: Fri Apr 06, 2018 11:03 am

cations

Postby 204929947 » Sun May 13, 2018 9:22 pm

So I'm still struggling with cations and anions.. so when its Na+ its a cation but can someone explain to me the difference in size? I remember something about the more protons, the smaller and the less protons, the bigger.. why is that???

Komal Prakash 1H
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Joined: Fri Apr 06, 2018 11:04 am
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Re: cations

Postby Komal Prakash 1H » Sun May 13, 2018 9:33 pm

As you move from left to right on a periodic table, the number of protons is increasing but the number of shells stays the same (n). Thus, the increase in protons increases the effective nuclear charge on the electrons and pulls them in tighter, so both atomic and ionic radius decrease as you move from left to right. As you move from up to down on the periodic table, the number of shells increases (n increases), so the atomic radius will increase. In the example for Na, Na+ has a smaller radius than Na, because Na+ has lost an electron and so the effective nuclear charge increases, so the radius will decrease.

MeghetyManoyan1A
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

Re: cations

Postby MeghetyManoyan1A » Sun May 13, 2018 9:34 pm

Cations are ions that have lost an electron/electrons. Since they have less electrons, the nucleus is able to pull them in more tightly. On the other hand, anions gain electrons. Having more electrons will cause more repulsion, leading to a larger size, relative to its parent atom.

Jocelyn1B
Posts: 27
Joined: Fri Apr 06, 2018 11:04 am

Re: cations

Postby Jocelyn1B » Sun May 13, 2018 9:56 pm

A cation is a positive charge and an anion is a negative charge. Anions have more electrons than protons where as cations has more protons than electrons.

JulietOttenberg-1C
Posts: 25
Joined: Fri Apr 06, 2018 11:04 am

Re: cations

Postby JulietOttenberg-1C » Sun May 13, 2018 10:01 pm

cations tend to be smaller in size because the positive charge of the atom is stronger than the negative charge of the atom. There is also less electron shielding, so the outer electrons are pulled in tighter by the positive nucleus.

Adam Yaptangco 1D
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Joined: Sun Dec 10, 2017 3:02 am
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Re: cations

Postby Adam Yaptangco 1D » Sun May 13, 2018 10:02 pm

Since it is a caption there are more protons than electrons meaning the electrons feel the attraction of the positively charged protons more making the cation smaller.


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