Because they have the same chemistry as the homologues in the same row. They need the same amount of electrons to fill their respective orbitals/suborbitals
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.
All the existing elements are natural the man made elements are rare and have a very short life.
112 Elements ( 92 Natural and 20 Man-made ) .
92 Today natural elements are considered the elements up to the atomic number 98; but the elements with atomic numbers 43, 61 and 93-98 exist only in extremely traces, as a curiosity in uranium deposits. Of course they can be obtained also by man made nuclear reactions. Consequently man made elements must be considered only the elements with the atomic number over 98: some examples are meitnerium, bohrium, flerovium.
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.
Out of the 112 elements known, 90 are found in nature and the rest (22 are man made).
Transuranium Elements
All the existing elements are natural the man made elements are rare and have a very short life.
Rutherfordium is a man-made (synthetic) element and its chemical properties have not been well studied. Due to its position in the periodic table, it is predicted that rutherfordium could potentially form a variety of ions, such as Rf2+ and Rf4+ based on trends in the behavior of elements in its group.
112 Elements ( 92 Natural and 20 Man-made ) .
Potassium is one of the elements.