IGCSE Physics : The Nuclear Atom

What is the charge of a proton?

• 1+

• 0

• 1-

• 2+

What is the charge of an electron?

• 0

• 1+

• 1-

• 2-

What is the mass of a neutron relative to a proton?

• 2

• Almost zero

• 1

• 3

What is the mass of an electron relative to a proton?

• Almost zero

• 1

• 1-

• 2

What is the charge of an ion which has lost an electron?

• Neutral

• Positive

• Negative

What is the atomic number of an atom?

• The number of neutrons

• The number of protons only

• The number of electrons only

• The number of protons as well as number of electrons

What is the mass number of an atom?

• The number of protons and neutrons

• The number of protons and electrons

• The number of electrons and neutrons

What are isotopes?

• Atoms of the same element with different numbers of electrons

• Atoms of the same element with different numbers of protons

• Atoms of the same element with different numbers of neutrons

What is the plum pudding model of the atom?

• An atom is a ball of positive charge with negative electrons embedded in it

• An atom is a ball of negative charge with positive electrons embedded in it

• An atom is a ball of positive charge with negative neutrons embedded in it

Which scientist found evidence for the existence of protons?

• James Chadwick

• Niels Bohr

• Ernest Rutherford