When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe? Exothermic
Endothermic
Both exothermic and endothermic
Neither exothermic nor endothermic

Answer///an early form of the atomic theory; dalton atomic theory;

The chlorine is the chemical property 

Firstly, the planetary model of the atom  failed  to explain why individual atoms produce discrete  line spectra. in fact, according to rutherford's model, each individual atom should produce a  continuous  line spectrum. the second flaw to his model was the fact that electrons orbit the nucleus in a circular fashion.

Answerjoule