The metal used for making X-ray window is:
List-I
List-II
(a) Be
(i) treatment of cancer
(b) Mg
(ii) extraction of metals
(c) Ca
(iii) incendiary bombs and signals
(d) Ra
(iv) windows of X-ray tubes
Question 17 Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al (a) Cl > Si >Al > Mg >Na (b) Na >Mg >Al >Si > Cl (c) Na > Al > Mg > Cl > Si (d) Al > Na> Si > Ca> Mg