The period number of an element with atomic number 19 is
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19 is in group 1st and period 4th. Note: Valence electrons are the electrons present in the highest energy level, here the highest energy level is 4s, and hence only one electron is present there. The element with 19 atomic no. is Potassium.
Answered by
1
Explanation:
19 is in group 1st and period 4th. Note: Valence electrons are the electrons present in the highest energy level, here the highest energy level is 4s, and hence only one electron is present there. The element with 19 atomic no. is Potassium.
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