1. La configuración electrónica del elemento Z 13 es: A. 1s2 2s2
B. 1s2 1s2 1p6 3s1
C. 1s2 1p4 1d5
D. 1s2 2s2 2p6 3s2 3p1

Express the following number in scientific notation. 0.026890 =

Why is nh3 classified as a polar molecule

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?