What is periodic table ? Give any four examples of periodic table ?
Answers
Answer:
Explanation:
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. 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.
The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The structure of the table shows periodic trends. The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right. The columns, called groups, contain elements with similar chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals.
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