In the current model of the atom, what are the two particles that are present in the nucleus?

An alpha particle is…

Uranium-235 has 92 protons. How many neutrons does it have?

What are isotopes?

What has an ionised atom lost or gained?

Four atoms have the numbers of protons and neutrons given below. Which two atoms are isotopes of the same element? W : 8 protons and 8 neutrons, X : 8 protons and 10 neutrons, Y : 10 protons and 8 neutrons, Z : 9 protons and 10 neutrons

An atom has 13 protons and 14 neutrons. What is its mass number?

Nitrogen-14 has 7 protons. How many neutrons does it have?

An atom has an atomic number of 9 and a mass number of 19. What are its numbers of protons, neutrons and electrons?

What is the best definition of the mass number of an element?

What is the formula of water?

What is the chemical symbol for the element mercury?