Here's how to break down the formula Cr(NH₃)₆(NO₃)₃ to determine the number of elements and atoms:

Elements:

* Cr: Chromium

* N: Nitrogen

* H: Hydrogen

* O: Oxygen

Total Elements: 4

Atoms:

* Cr: 1

* N: 1 (from NH₃) + 3 (from NO₃) = 4

* H: 3 (from NH₃) x 6 = 18

* O: 3 (from NO₃) x 3 = 9

Total Atoms: 1 + 4 + 18 + 9 = 32

Therefore, Cr(NH₃)₆(NO₃)₃ has 4 elements and 32 atoms.