Question

19) A pentavalent atom contains ____ number of electrons in its valence shell.  

2

4

3

5

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Answer 1

A pentavalent atom contains 5 number of electrons in its valence shell.

Answer 2

A pentavalent atom contains five number of electrons in its valence shell. Thus, the correct option is 'd' i.e. 5.

Detailed Explanation

• Pentavalent atoms are the elements having five electrons in their valence shells.
• Phosphorus, Antimony, Arsenic etc. are some examples of pentavalent atoms.
• In pentavalent atoms, pentavalent impurities such as arsenic and phosphorus added to make n-type semiconductors.
• Four impurity electrons added with outer silicon atom and one electron leaves free.

The diagram is given below for clear understanding: