Which statements about a phosphorus atom, P, are correct? 1. The nucleon number is 16.
2. The number of outer electrons is 5.
3. The proton number is 15.

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate