Select the correct description of atomic structure. * A. Protons and electrons are located in the nucleus.
B. Protons and neutrons are located in the nucleus and electrons circle.
C. Atoms are in the nucleus and electrons circle.
D. Electrons and neutrons are located in the nucleus and protons circle.

you either don't have the answers wrote out correctly or none are correct but b looks like closest answer

Explanation:

protons are positive and rest in the center with neutrons electrons (like the name suggests) go in the electron cloud (or circle)

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.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current