1.

The ratio of radii of first orbital of h,he+ and li2+ is

Answer»

He^+Li^{<klux>2</klux>+}Thus the ratio of radii of first orbital of H , and  is 3: 2: 1

Explanation:

Radius of an atom is given by the Bohr's equation:

r=\frac{0.529\times n^2}{Z}A^0

where,

r = radius of atom

n = number of orbit, for first n = 1, for second n = 2 and so on.

Z = ATOMIC number

a) For first orbital of H

r=\frac{0.529\times 1^2}{1}A^0

r=0.529A^0

He^+B) For first orbital of

r=\frac{0.529\times 1^2}{2}A^0

r=0.264A^0

Li^{2+}b) For first orbital of

r=\frac{0.529\times 1^2}{3}A^0

r=0.176A^0

He^+Li^{2+}Thus the ratio of radii of first orbital of H , and  is 3: 2: 1

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