A Potassium isotope contains 19 protons, 19 electrons and 21 neutrons. What is its mass number? 40

Adilute aqueous potassium nitrate solution is

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.

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