The Line spectra of two elements are not identical because:

The elements do not have the same number of neutrons

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They have different atomic numbers

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Their outermost electrons are at different energy levels

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They have different valencies

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Solution

The correct option is C Their outermost electrons are at different energy levels
The line spectra of two elements are not identical because their outermost electrons are at different energy levels and the energy absorbed by the electrons of the two different elements is different.

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Similar questions

Name the following :

(a) The element which does not contain any neutron m its nucleus.

(b) An element having valency 'zero'.

(d) Two atoms having the same number of protons and electrons but different number of neutrons.

(e) The shell closest to the nucleus of an atom.

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