There are two stable isotopes of bromine. Their masses are 78.9183 and 80.9163 amu. If the average atomic mass of bromine is 79.9091 amu, what is the natural abundance of the heavier isotope? percent abundance of 81Br __%

What are the chemical properties of chromium

How many grams of solid kcl are needed to prepare 250 ml of 0.235 m solution?

The atomic weight of hydrogen is 1.00794. a. True b. False

The table below gives the numbers of protons, electrons, and neutrons in four atoms. Atom Number of protons Number of electrons Number of neutrons 52 (39 39 12 40 40 bo 40 140 Based on the information that is given, which atom in the table has the

How many valence electrons are there in an atom with the electron configuration [noble gas]ns2 (n - 1) d10np3?

Active volcanoes are most likely to be found at what boundary

The radius of a cobalt atom is 1.25 Å. What is its radius in meters (m) ?

Concentration is just one stress that can affect the equilibrium position. Another is temperature. Describe how you would design this experiment to test for the effects of temperature on equilibrium position.

Although DNA evidence cannot be obtained from hair evidence without a root, which of the following can be obtained from hair evidence?

Carbon naturally occurs in two forms: diamond and graphite. Why do these two forms have very different properties?