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NEET - Chemistry
Structure of Atom Practice Q & A
Q:17
The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is
2
37
17
38
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Next Question
Ionisation energy of He
+
is 19.6 × 10
–18
J atom
–1
. The energy of the first stationary state (n = 1) of Li
2+
is
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