Question

Which discovery did scientists make when they arranged elements in order of increasing atomic mass?

A.
a repeating pattern of properties


 
B.
a puzzling series of numbers


 
C.
alphabetical arrangement of the names of elements


 
D.
a complex code of patterns and relationships

Answer 1

The correct option is A.
When scientists arranged elements in order of increasing atomic mass, they discovered that some properties of these elements are repeated in a regular manner and this discovery was used to form the periodic table. For instance, you will notice that all the elements arranged in each group have similar chemical properties