sblock Elements 2 Question 10
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10. The metal used for making $X$-ray tube window is
======= ####10. The metal used for making $X$-ray tube window is
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $\mathrm{Na}$
(b) Be
(c) $\mathrm{Mg}$
(d) $\mathrm{Ca}$
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Answer:
Correct Answer: 10. (d)
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.
