Radioactivity

Question 1

Isotopes

Answer 1

Atoms of the same element that differ in the number of neutrons in the nucleus.

Question 2

Stable

Answer 2

Describes a nucleus that does not change spontaneously. The protons and neutrons in the nucleus are help together strongly.

Question 3

Unstable

Answer 3

Describes an atom in which the neutrons and protons in the nucleus are not held together strongly.

Question 4

Radioisotopes

Answer 4

A radioactive form of an isotope.

Question 5

Nucleus radiation

Answer 5

Radiation from the nucleus of an atom, consisting of alpha or beta particles, or gamma rays.

Question 6

Alpha particles

Answer 6

Positively charged nuclei of helium atoms, consisting of two protons and two neutrons.

Question 7

Beta particles

Answer 7

Beta particles are charged particles. It also has the same mass and size as an electron.

Question 8

Gamma rays

Answer 8

High energy electromagnetic radiation when they have nuclear reactions.
No mass
Speed of light

Question 9

Half life

Answer 9

Time taken for half the radioactive atoms in a sample to decay. Changing into atoms of a different element.

Question 10

Cosmic radiation

Answer 10

Naturally occurring background radiation from out of space.