How many energy levels are in a krypton atom

4

Explanation: Number of Energy Levels:4

First Energy Level:2

Second Energy Level:8

Third Energy Level:18

Fourth Energy Level:8

Hope this helps! :)

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock