Yes
Yttrium is a natural element found in the Earth's crust. It is not a synthetic element.
Lithium is a natural element that is found in various minerals and salts in the Earth's crust. It is not a synthetic element.
Cadmium is a natural chemical element.
Boron is a naturally occurring element found in the Earth's crust. It is not a synthetic material.
Aluminium is a natural chemical element.
Phosphorus is an element. It's natural.
Francium is a natural chemical element.
No, boron is a naturally occurring element that is found in the Earth's crust. It is not synthetic.
Yes, xenon is a naturally occurring element found in trace amounts in the Earth's atmosphere. It is not a synthetic element.
no, both natural and synthetic rubber are polymers
Zirconium is a natural element. According to wikipedia it was first chemically isolated by Berzelius in 1824.
Aluminium is an element, it is not synthetic.