Chemistry-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 held 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

Nuclear radiation

Answer 5

This is the radiation that comes from the nucleus of an atom, consisting of alpha or beta particles or gamma rays.

Question 6

Alpha particles

Answer 6

These are positive charge nuclei of helium atoms,consisting of two protons and two neutrons.

Question 7

Beta particles

Answer 7

These are charge particles (positive or negative) with the same size and mass as electrons.

Question 8

Gamma rays

Answer 8

These are high energy electromagnetic radiations produced during nuclear reactions. They have no mass and travel at the speed of light.

Question 9

Half life

Answer 9

this is the time taken for half the radioactive atoms in the sample to decay that is, change into atoms of a different element.

Question 10

Cosmic radiation

Answer 10

Naturally occurring background radiation from outer space.