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The Atomic Number of an Element is 20. in Modern Periodic Table, this Element is Placed: (A) 2nd Period (B) 4th Period (C) 3rd Period (D) 1st Period - CBSE Class 10 - Science

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Question

The atomic number of an element is 20. In modern periodic table, this element is placed:

(a) 2nd period
(b) 4th period
(c) 3rd period
(d) 1st period

Solution

(b) 4th period.

Electronic configuration : K L M N
                                           2 8  8  2
Hence, from the electronic configuration, it is clear that the outermost electron goes into the 4th shell. So, the element would be placed in the 4th period.

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APPEARS IN

 Lakhmir Singh Solution for Chemistry for Class 10 (2019 Exam) (2018 to Current)
Chapter 5: Periodic Classification Of Elements
Q: 39 | Page no. 305
Solution The Atomic Number of an Element is 20. in Modern Periodic Table, this Element is Placed: (A) 2nd Period (B) 4th Period (C) 3rd Period (D) 1st Period Concept: Position of Elements and Trends in the Modern Periodic Table.
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