sblock Elements 2 Question 10
10. The metal used for making X-ray tube window is
(2019 Main, 10 Jan I)
(a) Na
(b) Be
(c) Mg
(d) Ca
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Answer:
Correct Answer: 10. (b)
Solution: Among the four elements given, $\mathrm{Na}, \mathrm{Be}, \mathrm{Mg}$ and $\mathrm{Ca}, \mathrm{Be}$ has highest IE value because of its smallest size and $2 s^2$ valence shell configuration.
So, $X$-ray cannot cause ionisation from the material used, i.e. Be in the tube window, which may cause interference in the study.
BETA
