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Answer:
1.8 x 10^24
One mole of helium has 6.02 x 10^23 atoms, thise number is also called Avogadro's number or constant.
If we need number of atoms for 3 moles so simply, multiply 3 by 6.02 x 10^23
so,
Number of atoms for 3 moles = 3 x ()
Number of atoms will be = 1.806x10^24
It has four valence electrons
Among the given options, Option (D) that is O, 
will have the same number of protons. Hence option (D) is correct.
<h3>What are
protons ?</h3>
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.
In option (D), All the three species (O, ) bears 8 protons but the number of electrons varies.
In any Ion, there will be no change in number of protons among the same atoms but number of electrons varies.
Therefore, Option (D) has same atoms but different ions.
Hence, it has same number of protons. Thus the correct answer is option (D)
Learn more about Protons here ;
brainly.com/question/12535409
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According to the principle, electrons fill orbitals starting at the lowest available energy states before filling higher states (e.g., 1s before 2s). The Madelung energy ordering rule: Order in which orbitals are arranged by increasing energy according to the Madelung Rule.
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