What property do all elements in the same column of the periodic table as boron have in common?

What property do all elements in the same column of the periodic table as fluorine have in common?

What properties do the elements in the same vertical column of the periodic table as fluorine have in common?

Observe the following elements in the modern periodic table?

What is the basis of modern periodic table?

Carbon (atomic number 6) and silicon(atomic number 14) are elements in the same group of the periodic table give the electronic arrangemetns of the carbon and silicon atoms and state the groups in which these elements occur.

Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that ?

Why all the crops do not grow in the same season?

Name the elements discovered after mendeleev's periodic table?