Yes they are everything around you is man made.
Supreheavy elements are not stable.
There are a couple elements who could have isotopes with 148 neutrons. The most stable isotopes of both americium and plutonium have 148 neutrons.
All the existing elements are natural the man made elements are rare and have a very short life.
Yes, these chemical elements are stable.
112 Elements ( 92 Natural and 20 Man-made ) .
Man-made elements are made in a particle accelerator.
Supreheavy elements are not stable.
There are a couple elements who could have isotopes with 148 neutrons. The most stable isotopes of both americium and plutonium have 148 neutrons.
All the existing elements are natural the man made elements are rare and have a very short life.
Examples of man made elements: curium, californium, bohrium, mendelevium, nobelium etc.
Yes, these elements are stable.
The 26 transuranic elements (elements with atomic numbers higher than 92) are man-made. Some lists also count technetium (element 43) as man-made as well. --------------- Now (January 2013) 97 chemical elements are considered as natural and 21 as man made.
Elements are stable when they have completely filled (or half filled) orbitals.
Yes, these chemical elements are stable.
112 Elements ( 92 Natural and 20 Man-made ) .
The 5 man made elements of light is xenon,krypton,argon,neon,and helium.
Rubber is man-made but has natural agents.