HALF-LIFE PERIOD
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The time required to a radio active substance to reduce its mass to half of the initial mass is called half life period.
It depends on the nature of radio active substance
100gms→50gms→25gms
Artificial radio activity:
It was invented by Irene Curie & Fredrick Juliot Curie
When a stable element is bombarded with heavier particles, then it exhibits the radio-activity. This phenomenon is called as artificial radio activity
Eg: 1. PLUTONIUM (named after dwarf planet pluto)
2. FERMIUM ( named after a scientist)
3. NEPTUNIUM (Planet)
4. Curium (Madam curie)
5. Eistenium