modern periodic table explain and explain water cycle
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Modern Periodic Law :
The modern periodic law states that the physical and chemical properties of the elements are the periodic functions of their atomic numbers.
Scientists arranged elements in increasing order of their atomic numbers from left to right across each row. And discovered that the elements having similar properties repeat after regular intervals.
Why atomic number and not atomic mass?
Atomic mass is the total mass of the protons and neutrons present in a nucleus of an atom. Whereas, the atomic number is the number of protons in a nucleus. Also, the number of protons in the nucleus is equal to the electrons present outside the nucleus.
We know that the nucleus is deep-seated inside an atom. But the electrons outside it, especially the ones in the outermost shell, are free to move around. Hence they take part in chemical reactions. For this reason, the properties of an element depend on the atomic number rather than the atomic mass.
Water Cycle
The water cycle, also known as the hydrologic cycle, is the continuous movement of water from the earth’s surface to the atmosphere and then back to the ground. It is a continuous process. Hence, it does not have a starting or an ending point. Thus, the water present on earth has been in circulation since the evolution of the earth. Water goes through all the three states, solid-liquid-gas, in the process. There are several factors that assist the water cycle, the sun, air currents to name a few.
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