Question

how are the elements in todays modern periodic table arranged?

in order of increasing atomic number

in order of increasing atomic mass

in order of decreasing atomic number

in order of decreasing atomic mass

Explanation:

The modern periodic table arranges elements based on the fundamental property of atomic number. Atomic number (number of protons in an atom) is a more consistent and fundamental property for classification compared to atomic mass. As we move from left - to - right in the periodic table, the atomic number of elements increases.

Answer:

in order of increasing atomic number