Quiz 2

1.     Identify the sub-atomic particle that has the least mass

• Nucleus

• Proton

• Electron

• Neutron

Answer explanation

Of the three subatomic particles, the electron has the smallest mass.

Identify the correct statement about the charges of subatomic particles

• Neutrons do not have a electric charge, they are neutral

• Protons have an electric charge

• Protons and electrons have the same charge

• Electron charges do not have anything to do with atoms

Answer explanation

A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

Please finishing drawing the Bohr diagram oh Helium.

P = 2

N = 2

E= 2

Answer explanation

Isotopes - an atom of an element with the​ (a)   number of​ (b)   but a ​ (c)   number of​ (d)   .

• same
• protons
• different
• neutrons

Answer explanation

Isotopes - an atom of an element with same the​ number of​ protons but a ​ different number of​ neutrons.

Iodine-131 has a half-life of how many days

• 32 days

• 8 days

• 16 days

• 24 days

Answer explanation

By looking at the graph you can see that half of the Iodine-131 has decayed every 8 days. We then say that Iodine-131 has a "half-life" of 8 days.

Identify the type of iodising radiation. ..... is radiation electromagnetic radiation, which has no electric charge. Therefore, the path of radiation is not effected by the electrically charged plates and continues in a straight line.

• Gamma

• Beta

• Alpha

Answer explanation

Gamma rays are uncharged, so are unaffected by the positive and negatively charged plates.

Identify the type of iodising radiation. ..... radiation consist of two protons and two neutrons which are positively charged and have comparatively large mass. The beam is thus attracted towards the negatively charged plate. The high mass means the particles have more momentum to continue in their original straight path.

• Gamma

• Beta

• Alpha

Answer explanation

Alpha particles deflect towards the negative plate and have a small deflection due to high mass.