P2.6 - Radioactivity Flashcards
An atom that looses an electron becomes a ??…
Positive ion
An atom that gains an electron becomes a ??…
Negative ion
The mass number is the number of ?
Neutrons and protons
Charge Mass
Neutron ? ?
Proton ? ?
Electron ? ?
Charge Mass
Neutron 0 1
Proton 1 1
Electron -1 Negligible
Why do atoms have no overall charge ?
Because they have equal numbers of electrons and protons
All atoms of the same element have the same number of _________ but can have different numbers of _________ . Atoms of the same element with different numbers of neutrons are called ________ .
Protons
Neutrons
Isotopes
In a stable atom the number of ______ & _______ are the same
Protons & neutrons
Unstable atoms have different numbers of ______ & ______
Protons & neutrons
Some unstable atoms will ________ emitting _______ _______ from the nucleus
Decay
Ionising radiation
If you change the neutron number, it effects the ????
Mass number
What is uranium
An element with isotopes that are radioactive
Where does radioactivity in uranium / elements come from ?
The nucleus
When we’re talking about radioactivity , we’re either talking about …
Energy or particles coming from the nucleus in question
What type of radioactivity is there ?
Gamma radiation
Alpha particles
Beta particles
What can be used to measure the amount of radioactivity coming from a substance ?
A Geiger - muller - tube
