Yes they are everything around you is man made.
There are a couple elements who could have isotopes with 148 neutrons. The most stable isotopes of both americium and plutonium have 148 neutrons.
Yes, they are true chemical elements but man made.
Up to uranium elements are made by stellar nuclear synthesis; after uranium elements are man made.
Yes, these chemical elements are stable.
Most elements are naturally occurring in the universe, with only a small percentage being man-made through processes like nuclear reactions in laboratories.
Man-made elements are made in a particle accelerator.
Examples of man made elements: curium, californium, bohrium, mendelevium, nobelium etc.
There are a couple elements who could have isotopes with 148 neutrons. The most stable isotopes of both americium and plutonium have 148 neutrons.
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.
The 5 man made elements of light is xenon,krypton,argon,neon,and helium.
Yes, they are true chemical elements but man made.
Up to uranium elements are made by stellar nuclear synthesis; after uranium elements are man made.
Out of the 112 elements known, 90 are found in nature and the rest (22 are man made).
Transuranium Elements
Yes, these chemical elements are stable.
Elements are stable when they have completely filled (or half filled) orbitals.
Most elements are naturally occurring in the universe, with only a small percentage being man-made through processes like nuclear reactions in laboratories.