Which of these periods contain elements with electrons in s, p, d, and forbitals?
a periods 1-3
b. periods 1-4
c. periods 3-5
d. periods 6-7

What does standard deviation reveal about data? a. the average of all the data points b. which of the data points is most reliable c. how spread out the data points are d. the percent error included in the data

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.