1. An atom has its first and second shell completely filled. What are the number of protons in the
nucleus? Give reason. plss help asap
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Explanation:
If the atom is neutral then the number of protons is equal to 10.
If the atom has -1 charge then it has 9 protons and so on(I have done this by keeping the number of electrons constant. In practical cases the number of electrons changes).
The formula to find the number of electrons in a shell is equal to 2n²
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