Periodic Classi...

How many elements have been classified in Newlands' octaves?

Which of the following was the limitation of Newlands law of octaves?

Which of the following properties was formulated by Mendeleev?

Which type of compound is formed by the elements of group 1 and group 7?

Four elements A, B, C and D having atomic numbers as A = 18, B = 17, C = 12 and D = 11. Among these, the element which belongs to the 3^rd period and has the highest ionisation potential is

Hydrogen is a/an

M, a newly discovered element, is placed in group IA of the periodic table because it forms a/an

Which of the following is an inert gas?

What is the valency of an element having atomic number 18?

How many valence electrons are present in an atom of nitrogen?

Which of the following elements have the same valency?

What is the valency of ⁵²X₂₄?

Which of the following elements has complete octet?

Which of the following electronic configurations represents a metal?

How many columns are there in a modern periodic table?

Which of the following noble gases shows the most electropositive character?

Which of the following has the largest size?

Which of the following groups have nearly the same atomic radius?

Why is the ionization energy of sulphur less than that of phosphorus, though sulphur is next to phosphorus in the period?

Which of the following statements is correct?