Question

Consider the following elements: 20 Ca , 8 O , 10 Ne , 16 s , 4 Be , 2 He Which of the following would you expect to be: i) Very stable ii) In group 2 of the periodic table iii) In group 18 of the periodic table

Answer 1

Answer:

[(Y,Ce,U,Fe)3(Nb,Ta,Ti)5O16], and euxenite [(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6].

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