Atoms are made up of protons, neutrons and electrons. Change the number of neutrons in an atom and it becomes an isotope, change the number of electrons, it becomes an ion.
What is the relative mass of the proton?
What is the relative charge on the neutron?
Uranium-235 has 92 protons. How many neutrons does it have?
What is an isotope?
A nucleus with the same number of protons but different number of electrons
A nucleus with the same number of protons but different number of neutrons
A nucleus with the same number of neutrons but different number of protons
What did Ernest Rutherford direct at a thin gold leaf in 1905?
A laser beam
What is the mass number of an element?
The number of protons and electrons
The number of protons and neutrons
The number of electrons and neutrons
What did Niels Bohr add to the Rutherford atomic model?
What has an ionised atom lost or gained?
What has changed in the structure of the Cu2+ ion?
It has gained two protons.
It has lost two electrons.
It has gained two electrons.
Why is deuterium sometimes called heavy hydrogen?
It has an extra electron.
It has an extra proton.
It has an extra neutron.