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Write the formula of the product formed ...

Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17). Draw its electron-dot structure. What is the nature of the bond formed?

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The electronic configuration of element A with atomic number 19 is 2, 8, 8, 1. It has one valence electron and valency of +1. 
The electronic configuration of element B is 2, 8, 7. It has 7 valence electrons and valency of -1. Hence, the formula of the product formed is AB. Its electron-dot structure is: 
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
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