A natural element exist in the nature independent on human activity; a man made element is obtained only in laboratories by processesdeveloped by men.
Mendelevium is a man made chemical element.
It is a natural element.
Selenium is a natural element.
No it is not.
Lanthanum is a natural element.
Actinium is a natural chemical element, it is not a man-made element.
Argon is a natural element found in the air.
No, Uranium is naturally occurring. But all elements beyond uranium are man-made.
No, it is a natural element
Seaborgium is a man made chemical element.
Germanium (Ge) is a natural element.
Berkelium is an artificial element.