Isotopes have the same number of protons but different number of:

1. list three scientific reasons cockroaches may fly.

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

Use the periodic table to answer the following questions. what is the predicted order of first ionization energies from highest to lowest for beryllium, calcium, magnesium, and strontium? o be > ca > mg > sr o be > mg > ca > sr o ca > sr> be > mg o sr > ca > mg > be done