Two nuclei A and B are isotonic with mass numbers 15 and 16 respectively . If A contains 7 protons , then the number of protons in B would be

Two nuclides A and B are isotonic .Their mass number are 76 and 77 respectively .If the atomic number of A is 32 then the atomic number of B will be

An atom contains the same number of protons and electrons.

A and B are two isotopes having mass numbers 14 and 16 respectively. If the atomic number of A is 7, then how many neutrons will be there in B?

(a) Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom? (b) The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?

For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons , neutrons and electrons respectively are :-

For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons , neutrons and electrons respectively are :-