Q20 of 181 Page 282

Name two elements that have two electrons in their outermost shells.

Barium and Radium are the two elements which have two elements in their outer most shell.


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19

What is the name of those elements which divide metals and non-metals in the periodic table ?

 20

Name three elements that have a single electron in their outermost shells.

 20

Name three elements with completely filled outermost shells.

 21

What is Dobereiner’s law of triads ? Explain with the help of one example of a Dobereiner’s triad.