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Answer:
The mass of silver is 
Explanation:
Given that,
The volume of the truck is 402 cubic feet or 1.138 x 10⁷ mm.
The density of silver is 10.49 g/mL.
We need to find the mass of silver that will fit in this moving truck. Density equals mass divided by volume. So,

1 gram = 10⁻⁶ Megagram

Hence, the mass of silver is 
What is the element with 7 protons? They probably also have 7 neutrons. Just a ball park figure guess.
In exothermic reactions, there is a release heat and the replacement of weak bonds with stronger ones.