2. What element does this represent?
1s22s22p3s23p4

Sodium

Explanation:

Explanation: The element with electron configuration 1s22s22p63s1 belong I A group in the periodic table and it is sodium because it loses one electron. We have periodic table in attachments. Sodium is a chemical element with the symbol Na and atomic number 11

It increased the number of molecular collisions is the indication about the effect of adding more solid.

Option: A

Explanation:

The collision theory states that a reaction occurs when there is collision between the particles. i.e (atoms, ions, or molecules). When a solid is added, there is increase in temperature of the solution.This is because of the result of the reaction of solid X when it is placed into the solution. The main postulate of the collision theory is that the particles have to collide to react.

So, the amount of particles is an important factor for the reaction rate. The rise in temperature when the solid is added to the solution is evident from this postulate as when there are more particles, there would be more collisions.As a result, there would be more reactions which results in increase in temperature.