Most of the elements, that are made by man, are highly unstable and extremely reactive. This means that they are mostly radioactive and definitely could pose a great risk to health.
Yes but many of them are harmful to both man and plants...
Man-made elements are made in a particle accelerator.
Examples of man made elements: curium, californium, bohrium, mendelevium, nobelium etc.
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.
Up to uranium elements are made by stellar nuclear synthesis; after uranium elements are man made.
Yes, they are true chemical elements but man made.
The man made objects in ozone layer are CFC's. They are harmful to ozone.
Out of the 112 elements known, 90 are found in nature and the rest (22 are man made).
No, it is false.
Transuranium Elements
All the existing elements are natural the man made elements are rare and have a very short life.