Ask Question
16 March, 13:39

An unknown element, X, reacts with rubidium to form the compound R b 2 X. In other compounds this element also can accommodate up to 12 electrons rather than the usual octet. What element could X be?

+3
Answers (1)
  1. 16 March, 13:57
    0
    Answer : The Correct answer is Tellurium (Te)

    In the compound Rb₂X, Rb is Rubidium which belongs from s block and group 1. Also its electronic configuration is [Kr] 5s¹, which suggest that oxidation state of Rb is + 1. Since there are two Rb atoms present so total positive charge is + 2.

    The compound is neutral means it has zero total charge so total negative charge is - 2. Also the there is one atom of X, so oxidation state of X must be - 2. Element with - 2 oxidation state belong to oxygen family or group 16. Electronic configuration of oxygen family ends with ns² np⁴, means if the element accommodate 12 electrons, the configuration will become ns² np⁶ nd⁴, which in turn says that element should have d orbitals.

    Oxygen and sulfur belongs to period 2 and 3 respectively so they cannot have d orbital. Tellurium belongs to period 5 (same period of Rb), it can extend its configuration to d orbital. So the X element can be "Tellurium " (Te).
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “An unknown element, X, reacts with rubidium to form the compound R b 2 X. In other compounds this element also can accommodate up to 12 ...” in 📙 Chemistry if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers