the second shell of an element contains 7 electrons only the number of protons in its nucleus is
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Answer: Hey, if the element has 7 electrons in its second shell (and I'm assuming that is its valence shell), then it's going to have 9 protons.
Explanation: That's because a total of 7 electrons in 2nd shell plus 2 electrons in 1st shell = 9 electrons (7+2=9). And, since an element in considered to be neutral (i.e. having the same number of electrons as protons), then your mentioned element has to have 9 protons.
Hope it helps.
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