Look at the two question marks between zinc (Zn) and arsenic (As). At the time, no elements were known

with atomic weights between 65.2 and 75. But Mendeleev predicted that two elements must exist with

atomic weights in this range. What led Mendeleev to predict that two undiscovered elements existed in

that range?

Question

Lily Hess

Physics

4 June, 13:48

Look at the two question marks between zinc (Zn) and arsenic (As). At the time, no elements were known

with atomic weights between 65.2 and 75. But Mendeleev predicted that two elements must exist with

atomic weights in this range. What led Mendeleev to predict that two undiscovered elements existed in

that range?

+1

Answers (1)

Know the Answer?

Johanna Humphrey · Answer 1

Mendeleev predicted the atomic mass of each element along with compounds they each should form.

Explanation:

Based on other elements in the same group he predicted the existence of eka-aluminum and eka-silicon, later to be named gallium (Ga) and germanium (Ge).