Question

Define mass number and atomic number how are these represented around the symbol of an element the mass number and atomic number of an isotope of uranium are 235 and 92 respectively calculate the number of protons and neutrons in the nucleus of the atom

Answer 1

Answer:

Mass Number is the sum of nucleons i.e. Protons and Neutrons. Mass Number is represented by A.

Atomic number is the number of Protons in an atom. Atomic number is represented by Z

So, if X is the symbol of element.

then Z is written in the bottom left or left subscript and A is written in upper left or left superscript of the element symbols.

So, Uranium would be written as follows:

²³⁵U

⁹²