An element have atomic number 19 and mass number 39. The number of neutron in its nucleus is-

Q. An atom has 16 neutrons in its nucleus. The atomic no. of the element is 15, the mass number of the element is :

Q. An atom has 16 neutrons in its nucleus. The atomic no. of the element is 15 and the mass number of the element is__________.

Q.

An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?

Q. An element has atomic number $17$ and mass number $37$. There are $17$ electrons outside the nucleus. Find the number of neutrons in it.

Q.

An element X has mass number 36 and number of neutrons 19. The atomic number of element X is: