12. Which is the configuration for the highest occupied shell of oxygen ( Z = 8)

Question

12.

Which is the configuration for the highest occupied shell of oxygen (Z = 8)?

sp3

s2p4

p6

s2d4

13.

Which scientist first proposed that electrons revolved in certain stable orbits, with a definite energy associated with each orbit?

Max Planck

Niels Bohr

Ernest Rutherford

J.J. Thomson

Part of the energy level diagram of a certain atom is shown in the diagram below. The energy spacing between levels 1 and 2 is twice that between levels 2 and 3. When an electron makes a transition from level 3 to level 2, radiation of wavelength ? is emitted.

What possible radiation wavelengths might be produced by other transitions between the three energy levels?

only ?/2

both ?/2 and ?/3

both 2? and 3?

only 2?

15.

At which wavelength does a 100 mW laser deliver 1.6 × 1017 photons in one second? Let 1 eV = 1.60 × 10?19 J, the speed of light c = 3.00 × 108 m/s, and Planck’s constant h = 4.136 × 10?15 eV ? s.

330 nm

350 nm

320 nm

340 nm

12.

Which is the configuration for the highest occupied shell of oxygen (Z = 8)?

sp3

s2p4

p6

s2d4

Explanation / Answer

12)

Here , as there are 8 electrons in the oxygen

the first shell contain 2 electrons,

second shell contain 8 - 2 = 6 electrons

Now , the configuration for 6 electrons in 2nd shell is

s2 p4

hence, the correct choice is s2 p4

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