1.

Electromagnetic radiation of wavelength 242nm is just sufficient to ionise na atom.The ionisation energy of na in kj mol-1

Answer»

Answer:

8.21*10^{-19}kJ

Explanation:

the given wavelength of an electromagnetic radiation is= 242nm= 242*10^{-9}m

the energy ASSOCIATED with this wavelength can be calculated by the formula

E=hc//\

here E stands for energy

h stands for Plank's constant whose value is 6.626*10^{-34} Js

c is the speed of light whic is equal to 3*10^{8}m/s

/\ stands for the  wavelength

so

E=6.626*10^{-34} * 3*10^{8} / 242*10^{-9} = 8.21 * 10^{-19}kJ

since it is the minimum energy required to remove VALENCE ELECTION from Na...it is the I.E. of Na

8.21 * 10^{-19}kJSo I.E. energy of Na is



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