Braemen Brown Asked: Mendeleev left gaps in his original periodic table due to which of the following reasons?

a)He had to leave gaps in order to make the periodic table square.

b)He was psychic and knew that elements were going to be discovered, so he may as well leave gaps for them.

c)He had to leave gaps to put elements with similar electron configurations into the same column.

d)The gaps were for elements in which the number of neutrons were known to be inaccurate.

e)He had to leave gaps in order to put elements with similar properties in the same column. He predicted that elements would be discovered to fill the blanks.