Why are some isotopes radioactive?

If I were to try to connect the north pole of one magnet to the north pole of another magnet, the two poles would: a. flip b. attract c. repel d. none of the above

When do water molecule forms hydrogen bond with another water molecule which atoms are involved in the interation?

The abundance of 12c is 98.9%. 13c is another naturally occurring isotope. what is the percent abundance of 13c?

A 10.0 gram sample of h2o at 23.0c absorbs 209 joules of heat. what is the final temperature

Resonance in air columns is used in which of these musical Instruments?

Anatom that has lewer neutrons than protons and more electrons than protons is

Which can have either a positive charge or a negative charge when they are released during radioactive decay? A. alpha particles B. beta particles C. positrons D. photons

Which ionic compound is water soluble? A. cuS B. NH4NO3 C. SrSO4 D. ZnF

What is part of an experiment that is not being tested and is used for comparison

Is hydrogen sulfide a heterogeneous mixture solution compound or element?