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 of a 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
Nitrogen-14 has 7 protons. How many neutrons does it have?
The mass number of an element is …
The number of protons and electrons
The number of protons and neutrons
The number of electrons and neutrons
The atomic number of an element is …
The number of protons
The number of electrons
The number of neutrons
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