Atomic Structure Flashcards
Radius of an atom
1x 10-10 meters
What is the basic structure of an atom
A positivity charge, nucleus composed of both protons and neutrons, surrounded by a negativity charged electron
Describe the arrangement of electrons
Electrons are arranged at different distances from the nucleus
How may the electron arrangement change?
With the absorption of electromagnetic radiation or by the emission of electromagnetic radiation
Do atoms have overall electric charge
No
Are some atomic nuclei unstable
Yes sir 👍
What is the process of radioactive decay?
It’s when the nuclei are unstable, and so then the nucleus then. gives out radiation as it changes to become more stable
What is activity the rate of?
Activity is the rate at which a source of unstable nuclei deacays
What is activity measured in?
Becquerel (Bq)
What is countrate?
It’s the number of decays recorded each second by a detector
What is the detector which detects the decays
Geiger muller tube
How is an alpha particle written
a
How is an beta particle written
B
How is an gamma ray written
Y
Describe an alpha particle
Consist of two neutrons two protons, and is the same as a helium nucleus
Describe an beta particle
It’s a high-speed electron ejected from the nucleus as a neutron turns into a proton
Describe an gamma ray
An electromagnetic radiation from the nucleus
Does the emission of cameras cost the mass charge of the nucleus to change?
Nah
Is radioactive decay random
Yeh
What is the half-life of a radioactive isotope?
The time it takes, for the number of nuclei of the isotope in a sample to halve ,or the time it takes for the count rate form a sample containing the isotope to fall to half of its initial level
What is radioactive contamination?
It’s the unwanted presence of material containing radioactive atoms and other material
What is the hazard from contamination? Due to
It’s due to the decay of contaminating, atoms the type of radiation admitted affect the level of hazard
What is irradiation the process of
Is the process of exposing an object to nuclear radiation. The irritated object does not became radioactive.
