IGCSE Radiation

In order of most to least penetrating radiation we have

• Alpha , Beta,  Gamma
• Beta , Gamma , Alpha
• Gamma, Beta, Alpha
• Gamma, Alpha, Beta

If we start off with element ₂₄X^50* after an gamma decay we get another element that looks like

• ₂₄X^50* 
• ₂₃X⁵⁰ 
• ₂₄X⁵⁰ 
• _25X⁵⁰ 

The half life of Technetium-99 which is used as a  medical radioisotope is

• 1 second
• 6 minute
• 1 hour
• 6 hours

If we start off with element ₂₄X⁵⁰ after a beta decay we get another element Y that looks like

• ₂₃Y⁵⁰
• ₂₂Y⁴⁶
• ₂₅Y⁵⁰
• ₂₄Y⁵⁰

If we start off with element ₂₄X⁵⁰ after an alpha decay we get another element Y that looks like

• ₂₂Y⁵⁰
• ₂₂Y⁴⁶
• ₂₀Y⁴⁸
• ₂₆Y⁵⁴

How many protons and neutrons in ₂₄X⁵⁰

• P = 24 N = 50
• P = 24 N = 26
• P = 26 N = 24
• P = 50 N = 24

Radioactivity is the controllable decay of an atomic nucleus

• True
• False

The number of neutrons in the nucleus is

• A
• Z
• A-Z
• Z-A

Mass number of the atom shown is

• 3
• 6
• 9
• 12

The atomic number Z of an atom is the number of

• protons only
• protons and neutrons
• nucleons
• neutrons only