Question

1. dmitri mendeleev studied the chemical characteristics of elements in the 1800s. he discovered that elements could be arranged in a table according to patterns that occur in their characteristics. which of these processes would be very difficult now without mendeleevs discoveries? using the chemical symbols of elements predicting the reactivity of elements mass of elements color of elements

Explanation:

Mendeleev's periodic table arranges elements based on their properties. One of the key advantages of the periodic table is that it allows for the prediction of an element's reactivity. Chemical symbols were already in use before Mendeleev. Identifying the color of an element is a simple observational task not dependent on Mendeleev's work. Measuring the mass of an element is a laboratory - based measurement that doesn't rely on Mendeleev's periodic table concept.

Answer:

predicting the reactivity of elements