In a redox reaction, which particles are lost and gained in equal numbers

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

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

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.