Periodic table in a chart in which elements having similar chemical and physical properties are grouped together.
Out of `Fe^(2+)` and `Fe^(3+)` ions which is smaller in size? Explain.

Periodic table in a chart in which elements having similar chemical and physical properties are grouped together. Group the following elements in pairs that you would expect to show similar chemical properties K, F, O, Na, Cl, S.

Why do elements in the same group have similar physical and chemical properties?

K^+ and Ca^(2+) are isoelectronic with Argon. Out of Na^+ and Na which has smaller size and why?

Ions having same number of electrons are called isoelectronic ions. Out of Na^+ and Ne which has higher ionisation enthalpy. Explain why?

Which elements show similarity in chemical properties in groups and periods in the periodic table? (Noble gases, Representative elements transition elements, Lanthanoids)

Evaluate the Mendeleev's periodic table and find the following. Are the same elements showing similar properties arranged in the same group or same period?

Which of the following is correct regarding the variation of properties in a group of the periodic table?