Which row correctly describes a medical use and an industrial use of radioactive isotopes?
Medical
Industrial
A
Cancer treatment
Coal stations
Power stations
с
Sterilising medical
equipment
Skin products
Sterilising medical
equipment
Radioactive dating
D
Extraction of crude oil

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

10 years is the answer

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.