First slide

Classical atomic models

Question

If the ionization energy of He⁺ is 19.6 × 10^-18 J per atom then the energy of Be³⁺ ion in the second stationary state is:

Moderate

A

$- 4.9 \times 10^{- 18} J$
B

$- 44.1 \times 10^{- 18} J$
C

$- 11.025 \times 10^{- 18} J$
D

None of these

Solution

E_H in first orbit $= \frac{- 19.6 \times 10^{- 18}}{4}$
$E_{B e^{3 +}}$ in second orbit
$= - (\frac{19.6 \times 10^{- 18}}{4}) \times \frac{16}{4}$
$= - 19.6 \times 10^{- 18} J$

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