Which term describes the sum of the number of protons and neutrons in an atom?

What kinds of sacrifices do governments face when considering how to reduce greenhouse gases?

In the ionic compound calcium chloride, how many chlorine ions are there for each calcium ion?

A group of engineers run a trial test on a space probe built for measuring the surface temperature of the sun. After the trial, the engineers realize that the probe melted and failed to collect the needed data. What should the engineers do next?

In an experiment, the density of an unknown liquid was calculated to be 0.78 g/ml. if the accepted value is 0.75 g/ml, calculate the percent error made.

The strongest intermolecular interactions between pentane (c5h12) molecules arise from

A) If you weigh a hydrated compound before and after heating it. Do you expect the mass to be more or less than before heating? Explain why. b) How about if you weigh a bag of popcorn before and after heating it.

Define the term relative molecular mass

It took many of the metals several minutes to begin to react. Once the reaction was initiated, several of these metals continued to react quite vigorously.

What dose the smooth ER do

How many valence electrons are in each atom?