Asystem absorbs 191 kj of heat and the surroundings do 120 kj of work on the system. what is the change in internal energy of the system?

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays

What does an electron configuration for an atom relate to the atoms placement on the periodic table