I say that the nature of the atom depends only on protons.
What do you say about it?
I support myself with fusion reaction on the sun.
Eg- if I remove all electrons in Mg , I will get Mg nucleus.
Also I am going to take out some protons ,say 3 electrons .
What is the substance I am going to get?

You'll need to clarify your question with more details..

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also I am going to take out some protons ,say 3 electrons .

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This sentence itself doesn't make sense. An electron is not a proton...