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This question is unclear. If you mean 3 full electron shells and nothing else, then it would be argon. But every element after argon has 3 full electron shells also, but they also have other shells with electrons. If you mean a full 3rd energy shell such as in having 3d10 electrons, then it would be Zn but Zn also has 4s2 electrons. So, the question is a vague one.
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What a period 3 element with 4 electrons in its outer shell?
n
What element has 2 electrons in the l shell?
The element with 2 electrons in the L shell is Lithium with atomic number 3. The electron configuration for Lithium is 1s^2 2s^1, meaning it has 2 electrons in the L shell.
How come the net charge of aluminum ions is plus 3 because there are-?
A neutral aluminum atom has 3 electrons in its outer shell and a full outer shell of 8 electrons below that. This full outer shell is stable, so aluminum will lose its 3 outer shell electrons to achieve that configuration.
Does indium need to gain 3 electrons to get a full outer shell?
Yes, indium needs to gain 3 electrons to achieve a full outer shell because it has 3 electrons in its outermost shell. By gaining 3 electrons, indium can achieve a stable octet configuration like the noble gases.
How many valence electrons are needed to make a full shell in a nitrogen atom?
3
