No, the 63 elements in Mendeleev's periodic table were not arranged in strictly consecutive order from atomic number 1 to atomic number 63. While Mendeleev's table was based on the increasing order of atomic weights (a concept similar to atomic numbers), it did not follow a completely consecutive sequence.
Mendeleev organized the elements based on their chemical properties and patterns in their atomic weights. He arranged the elements into groups and periods, placing elements with similar properties in the same column (group) and elements with increasing atomic weights across the periods (rows).
Mendeleev's periodic table included elements with atomic numbers 1 to 63, but the order of elements did not always correspond to the increasing order of atomic numbers. This is because the understanding of atomic numbers as we know it today was not fully developed during Mendeleev's time.
It was later discovered that the order of elements in Mendeleev's table largely corresponds to the increasing order of atomic numbers, with some exceptions and adjustments made to accommodate the observed chemical and physical properties of the elements. The modern periodic table arranges elements based on their increasing atomic numbers, which provides a more accurate and systematic organization of the elements.