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  4. Which of the following metal thermionically emit an electron at a relatively lowest temperature among them?

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Q. Which of the following metal thermionically emit an electron at a relatively lowest temperature among them?

Delhi UMET/DPMTDelhi UMET/DPMT 2009

Solution:

Molybdenum $(Mo)$ having electronic configuration $[K r] 4 d^{5}, 5 s^{1}$, due to the presence of one unpaired electron in the outermost shell, emits it readily even at low temperature.