Question

an element with atomic number 20 and mass number 40. write its electronic configuration​

Answer 1

Answer:

2,8,8,2

Explanation:

The electronic configuration is determined by the atomic number.

Atomic number is 20.

K shell - 2 electrons (max capacity is 2)

L shell - 8 electrons (max capacity is 8)

M shell - 8 electrons (max capacity is 8)

N shell - 2 electrons (max capacity is 18)

Answer 2

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The symbols used for writing the electron configuration start with the shell number (n) followed by the type of orbital and finally the superscript indicates how many electrons are in the orbital. For example: Looking at the periodic table, you can see that Oxygen has 8 electrons.