Question

 In isotopes the number of neutrons are—​

Answer 1

Answer:

The atomic number of the element equals the number of protons. Calculating the number of neutrons then becomes atomic mass of the isotope minus the atomic number of the element equals the number of neutrons. For uranium-235, atomic number 92, the number of neutrons is 235-92=143, or 143 neutrons.

Answer 2

As we know that isotopes are elements having the same atomic number but a different mass number.

They have the same chemical properties as the number of valence electrons are same.

For example

₆C¹²,  ₆C ¹³, ₆ C¹⁴  are the three isotopes of carbon. They have the same atomic number but different mass numbers due to difference in the number of neutrons.