Question

which of the following has octet electronic configuration a) sodium (atomic number 1) b) argon (atomic number 18) c) calcium (atomic number 20) d) lithium (atomic number 13)​

Answer 1

argon has octet electronic configuration

1.sodium (atomic number is 11)

so it's last shell will have 1 electron

2.argon (atomic number is 18)

so it's last shell will have 8 electrons

therefore, it has an octet electronic configuration

3.calcium (atomic number is 20)

so it's last shell will have 2 elections

4.lithium (atomic number is 3)

so it's last shell will have 1 electron

=> only argon has octet electronic configuration

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