Would you expect the first IE of two isotopes of the same elements to be the same or different ? Justify the answer.

For a particle to leave from the earth's field, it should be projected with a minimum velocity. An elephant and an ant are to be projected from earth into space. Whether the velocities required for doing so are the same or different? Justify your answer.

The atomic radii of the elements are almost same of which series

Find whether the following statement is right or wrong. All atoms of the same element show the same properties.

In which of the following molecules, the same element doesnot exhibit two different oxidation states

A rat and a horse are to be projected from earth into space. State whether the velocity is the same or different in projecting each animal. Justify.