In modern periodic table, The third, fourth, fifth, sixth and seventh periods have how many elements respectively?

Find incorrect statement about modern periodic table.

In which of the following pairs are the element found in the same period of the periodic table?

Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?

Element X forms a chloride with the formula XCl₂, which is a solid with high melting point. X would most likely be in the same group of periodic table as

Consider the following statements: Statement I: Some rare earth elements are used in the manufacture of flat television screens and computer monitors. Statement II: Some rare earth elements have phos…