quiz 2 sec 2

what is the scientific contribution which led to concluding the electronic configurations of the elements?

• Boyle’s definition of the element

• Analyzing the light emitted from the atoms when they acquire energy.

• Thomson’s atomic model

• Rutherford’s atomic model

If an electron acquires an amount of energy equals 1.89 eV to transfer from energy level L to M, then it............... to transfer from L to K

• loses an amount of energy equals 1.89 eV

• acquires an amount of energy equals 1.89 eV

• loses an amount of energy equals 10.2 eV

• acquires an amount of energy equals 10.2 eV

The excited electron tends to …………………….

• absorb energy to return to its ground state

• produce light with a definite wavelength and energy

• stay in its unstable state

• settle in a higher energy level

The spectral lines of the atom of any element indicate ..............

• the number of electrons in the atom of this element.

• the energy level where the electron is present.

• the energy of the electron in the energy level

• the difference in energy between two energy levels.

Bohr's atomic model ..............

• suggested that the electron occupies a definite energy level only.

• explained the line spectrum of hydrogen atom only.

• predicted the different energy levels in different multi-electron atoms.

• a and b together.

Bohr's atomic model differs from that of Rutherford, this difference is obvious in Bohr’s postulate that the electron ...............

• produces a spectral line when it loses a quantum.

• is a negatively charged particle.

• does not produce a spectral line when it loses a quantum

• revolves around the nucleus in certain orbits.

through studying the line spectrum of an atom, it is possible to know …….

• the type of the atom only

• the energy levels in the atom only

• the composition of the atom nucleus

• a and b together

According to Bohr’s atomic model, the electron. ….. to transfer from the first level K to the fourth level N

• acquires a quantum

• loses a quantum

• acquires 4 quanta

• loses 4 quanta

The ray whose wavelength is 486 nm lies in the ...............

• infrared region.

• ultraviolet region.

• visible region.

• infraviolet region

The difference in energy between each two consecutive energy levels .............

• increases by moving away from the nucleus.

• has no definite relation.

• is perfectly equal.

• decreases by moving away from the nucleus.