Which of the following has different masses in different elements?
Which of the following statements about a compound is incorrect ?
(a) A molecule of a compound has atoms of different elements
(b) A compound cannot be separated into its constituent elements by physical methods of separation
(c) A compound retains the physical properties of its constituent elements
(d) The ratio of atoms of different elements in a compound is fixed
Explain the following:
An element has atoms with different mass numbers.