The energy difference between the first two levels of hydrogen atom is 10.2eV. For another element of atomic number 10 and mass number 20, this will be

1020 eV

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2040 eV

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0.51 eV

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0.102 eV

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Solution

The correct option is A 1020 eV
Energy difference in hydrogen atom, $E_{H} = 10.2$ eV
Atomic number of another element $Z = 10$
Energy difference in that element $Δ E^{'} = 10.2 Z^{2}$
$∴$ $Δ E^{'} = 10.2 \times 10^{2} = 1020$ eV

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The energy difference between the first two levels of hydrogen atom is 10.2eV. For another element of atomic number 10 and mass number 20, this will be

The correct option is A 1020 eVEnergy difference in hydrogen atom, EH=10.2 eVAtomic number of another element Z=10Energy difference in that element ΔE′=10.2Z2∴ ΔE′=10.2×102=1020 eV

The correct option is A 1020 eV
Energy difference in hydrogen atom, $E_{H} = 10.2$ eV
Atomic number of another element $Z = 10$
Energy difference in that element $Δ E^{'} = 10.2 Z^{2}$
$∴$ $Δ E^{'} = 10.2 \times 10^{2} = 1020$ eV