Question : In which year did AEB de Chancourtois organise the elements by atomic weight by graphing the elements around a cylinder with a circumference of 16 units, corresponding to the weight of oxygen (O)?

Option 1: 1862

Option 2: 1860

Option 3: 1870

Option 4: 1868

Question : Identify the correct statement about Newlands' law of octaves.

Option 1: He started with the element having the highest atomic mass (hydrogen) and ended with thorium which was the 56th element

Option 2: He started with the element having the lowest atomic mass (hydrogen) and ended with sodium

Option 3: He started with the element having the lowest atomic mass (hydrogen) and ended with aluminium

Option 4: He started with the element having the lowest atomic mass (hydrogen) and ended with thorium which was the 56th element

Question : When did Dmitri Mendeleev invent the periodic table, ordering the symbols of the chemical elements according to their atomic weights?

Option 1: 1794

Option 2: 1869

Option 3: 1890

Option 4: 1779

Question : What is the common characteristic of the elements of the same group in the periodic table?

Option 1: Electrons in the outermost shell

Option 2: Total number of electrons

Option 3: Total number of protons

Option 4: Atomic weight

Question : Which of the following are members of 15 naturally occurring metallic chemical elements whose atomic numbers are between 57 and 71?

Option 1: Alkali metals

Option 2: Lanthanides

Option 3: Halogens

Option 4: Actinides