U1 AOS 2 SAC Revision

• 4 protons only

• 4 protons and 4 neutrons

• 4 protons and 5 neutrons

• 4 protons and 9 neutrons

Answer explanation

How many neutrons does the following isotope have?

Answer explanation

The letters representing isotopes of the same element are:

• V & Z

• W & X

• W & X & Y

• Y & Z

Answer explanation

The letter representing an ion is:

• V

• W

• X

• Y

Answer explanation

The most common isotope of molybdenum has

• 58 neutrons

• 56 neutrons

• 52 neutrons

• 50 neutrons

Answer explanation

The success of particle physics lies in large part to the discovery of particles that were

predicted by theory. Which of the following particles was discovered after theoretical

prediction?

• Alpha particle

• Electron

• Neutron

• Proton

Answer explanation

Discovered by James Chadwick in 1932, the neutron was theoretically predicted. The existence of a neutral particle in the atomic nucleus was proposed by Ernest Rutherford in 1920 to account for discrepancies between atomic number and atomic mass.

Consider this list of different types of radiation: alpha particles, X-rays, beta particles, microwaves, gamma rays. Which of these has a positive electrical charge?

• alpha particles

• X-rays

• beta particles

• microwaves

• gamma rays

Consider this list of different types of radiation: alpha particles, X-rays, beta particles, microwaves, gamma rays. Which of these is able to ionise matter?

• alpha particles

• X-rays

• beta particles

• microwaves

• gamma rays

Consider this list of different types of radiation: alpha particles, X-rays, beta particles, microwaves, gamma rays. Which of these has the greatest penetrating ability?

• alpha particles

• X-rays

• beta particles

• microwaves

• gamma rays

• gamma radiation

• cosmic rays

• alpha decay

• beta minus decay

Answer explanation