What’s the radius of 1^st orbit of He^+ atom?(a) 0.1058 nm(b) 0.2156 nm(c) 0.00529 nm(d) 0.02645 nmThe question was asked in my homework.The doubt is from Bohr’s Model for Hydrogen Atom in division Structure of Atom of Chemistry – Class 11

What’s the radius of 1^st orbit of He^+ atom?(a) 0.1058 nm(b) 0.2156

1.	What’s the radius of 1^st orbit of He^+ atom?(a) 0.1058 nm(b) 0.2156 nm(c) 0.00529 nm(d) 0.02645 nmThe question was asked in my homework.The doubt is from Bohr’s Model for Hydrogen Atom in division Structure of Atom of Chemistry – Class 11
Answer» Correct answer is (d) 0.02645 NM Easiest EXPLANATION: The ATOMIC radius of an atom is given by the FORMULA rn = 52.9n^2/Z pm, where rn is the radius of nth ORBIT of an atom and Z is the atomic number of that atom. For He^+, n = 1 and Z =2. Radius = 52.9(1)/2 pm = 0.02645 nm.

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