Question

explain how name and symbol of element or given in modern days.

Answer 1

The periodic table has undergone extensive changes in the time since it was originally developed by Mendeleev and Moseley.  Many new elements have been discovered, while others have been artificially synthesized.  Each fits properly into a group of elements with similar properties.  The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group.
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Answer 2

Each element is denoted by a symbol which is usually the first letter of it's English and Latin name written in capital however if the first letter of two elements are the same the elements are denoted by two letters and the second one is written in small.