terbium is synthetic i believe
Yes
Nearly all, 99.988%, of tantalum found in nature is stable. The natural radioactive isotope, 180mTa, accounts for 0.012% of it, and is believed to have a very long half life of about 1,200,000,000,000,000 years. Like all elements, tantalum has synthetic radioactive isotopes.
it is wered
It is synthetic, but what we use to make concrete is natural AND synthetic.
is bromine natural or synthetic?
Polyester is synthetic.
it is synthetic
synthetic
Cotton and wool are natural; nylon is synthetic.
Semi-synthetic
they are synthetic.
synthetic