Atoms and atomic structure Flashcards
What are the two distinct regions of an atom?
Nucleus
Electron cloud
What is the nucleus composed of?
Positively charged protons and uncharged neutrons
What is an electron cloud?
It is a diffused region of negative
charged electrons which surround the nucleus.
Give the properties of an electron.
-Tiny and light particle
-Move in rapid motion
-Does not constitute to the mass of an atom
What determines the properties of an atom?
The organization of electrons
What is radioactive decay?
The process in which atoms split into smaller particles and release a large amount of energy.
What is a material containing unstable nuclei called?
Radioactive material
According to Dalton’s theory atoms can be converted to any other type of atom.
True/False
False
Element with same atomic number and different mass number is called __
Isotopes
Which radioisotope is used to detect clots in the artery?
Thallium 201 chloride
which radioisotope is used to detect thyroid function?
Radioiodine
What are radioisotopes?
Isotopes which emit particles and energy. It has identical chemical behavior but unique nuclear behavior.
Atomic mass-Atomic number=
Number of neutrons
