When the elements are arranged on the increasing order of their atomic number, then the anomalies could be removed.

(i) The position of isotopes was resolved in the modern periodic law. All the isotopes of an element have the same number of protons, so their atomic number is also the same. Due to same atomic number, they can be put in one place.

(ii) The position of cobalt and nickel was also resolved. The atomic number of cobalt is 27 and that of nickel is 28. Now, according to modern periodic law, the cobalt with lower atomic number (27) should come first and nickel with higher atomic number (28) should come later, even if their atomic masses are in the wrong order.

(iii) The position of hydrogen is also resolved because in modern periodic law hydrogen is placed in first group of alkali metals because alkali have 1 valence electron in its last shell and hydrogen also has 1 electron in its last shell.