Promethium is man made element.; the natural promethium is estimated to be less than 1 kg in the earth crust.
Potassium is naturally made
The opposite of naturally occurring would be artificially created or man-made.
Not all the elements occur naturally; some elements are man-made.
Metal that is a naturally occurring element.
Iodine is a naturally occurring element.
naturally occurring.
Potassium is naturally made
No - it's a man-made object. But the stuff it is made from is naturally occurring.
Phosphorus is naturally occurring. It is found in rocks
Thallium is a naturally occurring element in the Earth's crust. It is not a man-made element.
Although promethium exist in traces in the Earth crust it is an artificial element.
No - it's a man-made object. But the stuff it is made from is naturally occurring.
The opposite of naturally occurring would be artificially created or man-made.
No. It's man-made.
Naturally occuring.
No. It is a "Rare Earth"- found only in trace amounts, but naturally occurring.
Not all the elements occur naturally; some elements are man-made.