Modern periodic table
1)The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it. (Valence electron is the number of electrons in outermost shell)

2)Horizontal rows in the periodic table are called

3)Which noble gas has less than 8 electrons in the valence shell of its atom ?

4)Neon is an example of a/an: 

5)Sodium is in the same group or family as:


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