ICSE.X.PHYSICS. 12. RADIOACTIVITY

What is the term used to describe the number of protons in the nucleus of an element?

• Mass number

• Atomic mass

• Atomic number

• Neutron count

What are protons and neutrons collectively referred to as in the nucleus?

• Electrons

• Nucleotides

• Isotopes

• Nucleons

What is the sum of the number of neutrons and protons in a nucleus called?

• Atomic mass

• Atomic number

• Mass number

• Neutron number

Atoms of the same element with the same atomic number but different mass numbers are known as:

• Isomers

• Isotones

• Isobars

• Isotopes

Atoms of different elements with the same mass number but different atomic numbers are referred to as:

• Isomers

• Isotones

• Isobars

• Isotopes

What are atoms with the same number of neutrons but different numbers of protons and electrons called?

• Isomers

• Isotones

• Isobars

• Isotopes

What type of forces bind nucleons together in the nucleus?

• Electromagnetic forces

• Gravitational forces

• Nuclear forces

• Repulsive forces.

What is the term for the spontaneous emission of radiation from an unstable nucleus?

• Radioactivity

• Nuclear fusion

• Nuclear fission

• Radioactive decay

Which elements show natural radioactivity, typically with atomic numbers greater than 82?

• Noble gases

• Alkali metals

• Lanthanides

• Actinides

What is the composition of an alpha particle, and how is it represented?

• Two protons and two electrons; 2/1 He

• Two protons and two neutrons; 4/2 He

• Two electrons and two neutrons; 4/1 He

• Two protons and four neutrons; 6/2 He