Which group of the modern periodic table include lithium, sodium, potassium, rubidium, caesium, and francium?
Smita studied about the Modern Periodic Table. She placed hydrogen, lithium, sodium, and calcium in the same group in the periodic table. However, her teacher told her that she has placed one element incorrectly in the periodic table.
(Atomic numbers of H, Li, Na, and Ca are 1, 3, 11, and 20 respectively)
Which element has been placed incorrectly by Smita?