There are four naturally occurring isotopes of
the element chromium. the relative abundance
of each is
50cr 4.345% 49.946044 amu
52cr 83.789% 51.940508 amu
53cr 9.501% 52.940649 amu
54cr 2.365% 53.93880 amu
find the average atomic mass of chromium.
1. 51.996 amu
2. 53.2503 amu
3. 52.061 amu
4. 52.978 amu

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit