Quiz 1: Lecture 4 Videos Flashcards
What determines an element’s identity?
Number of protons
What do protons need to hold them together?
Neutrons “Nuclear glue” holding protons together
What do neutrons hold protons together with?
Strong nuclear force
Hydrogen-1 has how many neutrons?
Hydrogen-2 (Deuterium)
Hydrogen-3 (Tritium)
0 neutrons
1 neutron
2 neutrons
Which is the heaviest isotope of hydrogen?
Tritium
Radioisotope:
An isotope of an element that has unstable nucleus
The more stable a nucleus is,
The slower its rearrangement
Radioactive Decay:
The process by which an unstable nucleus rearranges itself
What can be used as medical tracers?
Radioisotopes
(also used in radiotherapy to kill malignant cancer cells)
Isotopes of an element share…
Chemical properties
Unstable isotopes are
Radioactive
Beta plus decay:
(Also called Positron Emission)
Positively charged electron, or POSITRON, or beta-plus particle
“Antimatter”
Nuclear equation:
Top number 0: combined number of protons and neutrons is zero
Bottom number 1: positive charge
Nuclear equation for 18-9F
18-9F -> 18-8 O + 0-1 B
Electron + positron=
2 gamma rays
