The correct answer is 7 I just took the test :)
Answer:
a community or group of living organisms that live in and interact with each other in a specific environment.
Explanation:
Tarnish is Ag2S-silver sulfide and the oxidation state of silver is +1
Protons, the number of protons cannot change or the element will change as well.
There are two subshells that are s and p, which are present in the second energy level.
The energy level can be defined as the fixed distances from the nucleus of an atom where electrons may be found. Each energy level is divided into some Subshells. These subshells are known as s-subshell, p-subshell, d-subshell, and f-subshell. This subshell contains some orbitals, these orbitals are the place where there is the maximum probability of getting the electrons. In one orbital, a maximum of two electrons can be present.
Hence, there are two subshells in the second energy level.
Learn more about subshells here:
brainly.com/question/26438203
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