Question

write the symbol for every chemical element that has atomic number greater than 33 and atomic mass less than 84.9 u.

Explanation:

Step1: Recall element - atomic number and mass relationship

We need to refer to the periodic table.

Step2: Identify elements based on criteria

Elements with atomic number \(Z>33\) and atomic mass \(A < 84.9\ u\). Starting from atomic number 34 (Selenium, \(Se\)) with atomic mass approximately \(78.96\ u\) and atomic number 35 (Bromine, \(Br\)) with atomic mass approximately \(79.904\ u\). Elements with atomic number 36 (Krypton, \(Kr\)) has atomic mass around \(83.798\ u\), while the next element Rubidium (\(Rb\)) with atomic number 37 has atomic mass \(85.4678\ u\) which is greater than \(84.9\ u\).

Answer:

\(Se, Br, Kr\)