3d
<span>20
electrons means that the one 4s orbital is filled up. Then the electrons
will fill up the five 3d orbitals and finally the three 4p orbitals to
complete energy level 4 </span>
The answer is SmCl3 I got that answer from how many years I been studying
Answer:
0.0111 M
Explanation:
pH = 4.5
[H3O+] = ?
Relationship between both quantitiesis given by:
pH = -log₁₀ [H3O+]
-pH = log₁₀ [H3O+]
-4.5 = log₁₀ [H3O+]
[H3O+] = e ^ (-4.5)
[H3O+] = 0.0111 M
