Which of these letters is not found on the periodic table ?

Group 11 metals are called Coin metals. Which metal doesn't belong in the group ?

In the modern periodic table the period indicates the value of ______

The atomic number of an atom is the number of ______ in the atom's nucleus.

Elements in the same group have ____

Valence electron of Selenium is ___

Do you know for which elements Mendeleev left a gap when he created the table ? Its symbol is Ga

Dmitri Mendeleev proposed the periodic table in the year ______

Do you know which of these non-metal elements glow in the dark ?

Do you know which element is about 78% of the air we breathe ?

Found in milk , which of these element is the eighth most abundant on earth ?

The rows in the periodic table are called ___