Answer:
n=1 holds two electrons and n=2 holds eight electrons.
Explanation:
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In this case, since the atomic number of aluminum is 13, its electron configuration is:
![Al^{13}: 1s^2,2s^2,2p^6,3s^2,3p^1](https://tex.z-dn.net/?f=Al%5E%7B13%7D%3A%201s%5E2%2C2s%5E2%2C2p%5E6%2C3s%5E2%2C3p%5E1)
In such a way, we can see that the level n=1 is filled with two electrons since the subshell s is able to hold two electrons and the level n=2 is also filled but with eight electrons as s holds two whereas p holds 6. Moreover, n=3 is holding three electrons.
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D. all of these can produce nuclear energy
Your answer is D; Not all living things can maintain homeostasis.
Actions form positive ions while anions forms negative
Physical property is C.Density