What is the relative mass of the proton?
1
0
1/2,000
What is the relative charge on the neutron?
-1
Uranium-235 has 92 protons. How many neutrons does it have?
143
92
235
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?
Alpha particles
Bullets
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?
Electron orbits
A nucleus
Neutrons
What has an ionised atom lost or gained?
Protons
Electrons
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 \(_{1}^{2}\textrm{H}\) sometimes called heavy hydrogen?
It has an extra electron.
It has an extra proton.
It has an extra neutron.