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akeCovalentActivity.do?locator-assignment-take&takeAssignmentsessionLocator-assigM The valence of an element is the number of covalent bonds its atoms forn ion it forms in ionic compounds. For the following questions, use the position of an element in the periodic valence. (1) What is the valence of tellurium? 6 (2) What is the valence of gallium? 3 v (3) What is the valence of arsenic? 5 V An error has been detected in your answer. Check for typos miscalculations etc. before submitting your answer Submit Answer Retry Entire Group 7 more group attempts remai

Explanation / Answer

Answer (1) :-

The number of electrons present in the outer most shell of an atom is called its valency.

Hence,

52Te (tellurium) - 1s22s22p63s23p63d104s24p64d105s25p4

From the above electronic cofiguration, 6 electrons are present in the outer most shell of tellurium. So 'valency of tellurium is 6'.

31Ga (gallium) - 1s22s22p63s23p63d104s24p1

From the above electronic configuration, 3 electrons are present in the outer most shell of gallium. So 'valency of gallium is 3'.

33As (arsenic) - 1s22s22p63s23p63d104s24p3

From the above electronic configuration, 5 electrons are present in the outer most shell of arsenic. So 'valency of arsenic is 5'. Valancy 3 is also possible in arsenic, in which 4s2 electrons are present as lone pair of electron.

Answer (2) :-

* Formula of hydride formed by cesium is CsH.

* Formula of hydride formed by argon is ArH. Naturally agron hydride is present as argon monohydride.

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