An unknown element, x, reacts with rubidium to form the compound rb2x. in other compounds this element also can accommodate up to 12 electrons rather than the usual octet. what element could x be?

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emilydis8556 emilydis8556

24-09-2017
Chemistry

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An unknown element, x, reacts with rubidium to form the compound rb2x. in other compounds this element also can accommodate up to 12 electrons rather than the usual octet. what element could x be?

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barnuts barnuts · Answer 1 · 2017-10-04T16:15:14+02:00

barnuts barnuts

04-10-2017

There are few elements that can form 12 electron rather than the usual 8. Therefore these are the possible answers:

Sulfur = 2Na + S --> Na2S
Selenium = 2Na + Se --> Na2Se
Tellurium = 2Na + Te --> Na2Te

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pstnonsonjoku pstnonsonjoku · Answer 2 · 2021-10-29T18:27:36+02:00

The element in question is sulfur(S).

Rubidium belongs to group 1 in the periodic table. It is an alkali metal hence it has a valency of 1. An element that could form a compound of the formula Rb2X must be a group 16 element. The elements of group 16 has a valency of 2.

Among the options, the only element of group 16 listed is sulfur(S). Sulfur is capable of expanding its octet and accommodating up to 12 electrons. Hence, the element in question is sulfur(S).