Consider the two electron arrangements for neutral atoms A and B. What is the atomic number of A? A - 152, 252, 2p9, 351
B - 152, 252, 2p5, 5s
A.) 8
B.) 19
C.) 11

10.063g / 10.00 ml = 1.0063 g/ml which rounds off to 4 sig figs as: 1.006 g/ml

Sorry i dont understand the question can you rephase it?

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

Ithink the answer is c