Question

modern periodic table​

Answer 1

in which the element were placed in a table in the atomic number so that why he didn't get any wrong format this table have 18 groups and 7 periods and all the element have correct place and it was made by Henry Mosley.

its have to enough for modern periodic table if any other problem then you may ask

Answer 2

The modern periodic table is used to organise all known elements. In Modern periodic table the elements are arranged in the increasing order of their atomic number.In this table each element is represented by a chemical symbol.