Compound AH(kJ/mol)
CaO(s)| -1573
CaCO3(s) -1,207.1
C6H6(g) 82.90
CO2(g) -393.5
H2O(g) -241.82
NO2(g) | 33.84
What is the enthalpy of reaction for the
decomposition of NO2(g)?
2NO29) ► N2(g) + 202(9)

Sorry i dont understand the question can you rephase it?

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts