organic compounds are those upon which life depends, and they all contain carbon. in fact, the definition of an organic compound is one that contains carbon. it's the sixth most abundant element in the universe, and carbon also occupies the sixth position on the periodic table. it has two electrons in its inner shell and four in the outer one, and it's this arrangement that makes carbon such a versatile element. because it can combine in so many different ways, and because the bonds carbon forms are strong enough to remain intact in water – the other requirement for life – carbon is indispensable for life as we know it. in fact, an argument can be made that carbon is necessary for life to exist elsewhere in the universe as well as on earth.
most events like the rising and setting of the sun were used a natural measurement of time until recently.
solar time, which is based on the motion of the sun, is not the only way of measuring time, however. one might keep track of the regular appearance of the full moon. that event occurs once about every 29.5 solar days. the time between appearances of new moons, then, could be used to define a month.
one also can use the position of the stars for measuring time. the system is the same as that used for the sun, since the sun itself is a star. all other stars also rise and set on a regular basis.
although any one of these systems is a satisfactory method for measuring some unit of time, such as a day or a month, the systems may conflict with each other. it is not possible, for example, to fit 365 solar days into 12 or 13 lunar months exactly. this problem creates the need for leap years
i abbreviated most of it but there is a ton more at this link if you still need more.
explanation: potassium is an element with atomic number 19, thus it contains 19 electrons. it is a metal which readily loses its electrons to acquire stable configuration of argon which has 18 electrons with completely filled subshells.