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