Answer:
3 elements
Calcium,oxygen and hydrogen
protons, neutrons, and electrons.
I don’t know if I am right but I think it is symbol for the first one and the second one is formula.
If there is a constant loss of 
the concentration of 
will be affected and decrease since 
is a main component of 
.
Hope it helped,
BioTeacher101
Lewis symbol for K+ is given by a dot and K.
<h3>Meaning of
Lewis symbol</h3>
Lewis symbols can be defined as a symbol the is used in describing the valence electron configurations of an atom ions.
A Lewis symbol consists of the symbol of the element and then surrounded by one dot for each of its valence electrons.
In conclusion, Lewis symbol for K+ is given by a dot and K.
Learn more about Lewis symbol: brainly.com/question/6605265
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