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An Intiative by Sri Chaitanya
a
its atomic number is 3
b
an electron of 90 eV can excite it.
c
an electron of kinetic energy nearly 91.8 eV can be brought to almost rest by this atom.
d
an electron of kinetic energy 2.6 eV may emerge from the atom when electron of kinetic energy 125 eV collides with this atom.
answer is A.
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