Answer:
Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.
The new temperature (T₂) in the lab = 25.09 °C
<h3>Further explanation</h3>
Given
V₁=2.15 ml
T₁ = 17 + 273 = 290 K
P = 740.2 mmHg
V₂ = 2.21 ml
Required
The new temperature (T₂)
Solution
Charles's Law
<em>When the gas pressure is kept constant, the gas volume is proportional to the temperature </em>

Input the value :
T₂=(T₁.V₂)/V₁
T₂=(290 K x 2.21 ml)/2.15 ml
T₂=298.09 K = 25.09 °C
Explanation:
As the anodes dissolve away, the cathodes on which the pure metal is deposited grow in size. The impurities in the copper anode include lead, zinc, nickel, arsenic, selenium, and several precious metal including gold and silver.