What is the radius of first orbit of he?

The energy associated with the first orbit of He+ is ____________ J.

• − 2.18 × 10−18

• − 0.54 × 10−18

• − 8.72 × 10−18

• − 4.69 × 10−18

The energy associated with the first orbit of He+ is − 8.72 × 10−18 J.

Explanation:

Energy of first orbit of He+:

En = `-2.18 xx 10^-18 (("Z"^2)/("n"^2)) "J"`

= `-2.18 xx 10^-18 (2^2/1^2)`

= − 8.72 × 10−18 J

Concept: Bohr’s Model for Hydrogen Atom

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