Elements have families as well, known as isotopes. Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table.
Answer:
Distance
Explanation:
The light-year is a measure of distance, not time. It is the total distance that a beam of light, moving in a straight line, travels in one year.
CFC stands for ChloroFluoroCarbon. CFC's are a class of chemical compounds containing only halogenated (often chlorine, fluorine) carbon atoms. They are commonly used in refrigeration, air conditioning and as propellants in aerosol cans. There are many chemical compounds classified as CFCs, one of the most well known is freon, which is used in air conditioners to make the air cool.
However useful CFCs have been, they also have a very negative effect on climate change and the Earths ozone layer when they're released into the environment.
The Earths ozone layer is predominately made up of a chemical called ozone. CFCs react with ozone (O3) turning it into oxygen (O2). This not only thins or depletes our ozone layer but creates weather hot spots as ozone absorbs UV-B radiation coming from the sun. Having less ozone allows more of this high energy radiation to reach the Earths surface. Kind of like a magnifying glass pointed at us.
This is why scientists, governments and companies are actively looking for alternative chemicals to use in place of CFCs. So that we can stop using them and depleting our ozone layer.
hope this helps
Answer:
Belong to the same group.
Explanation:
Different elements are most likely to react in similar ways when they belong to the same group.
This is because the elements in the same group always have similar number of valence electrons which implies that they all have the same number of electrons in their outermost shell. For example,barium (Ba), beryllium (Be), calcium (Ca), magnesium (Mg), radium (Ra), strontium (Sr) all have 2 electrons in their outermost shell and thus they belong to group 2 of elements which are known as Alkaline earth metals and they all tend to react in the same manner with other substances
A gold ring is endless and has a certain diameter, it has luster, shine and other metallic properties and cash value that is not the same as raw gold.
