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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 - Science

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

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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 Class 10 Chemistry (Science)
Chapter 5 Periodic Classification Of Elements
Q 39 | Page 305
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