Final answer:
JJ Thomson concluded that atoms must balance positive and negative particles.
Step-by-step explanation:
From his experiments, JJ Thomson concluded that atoms must balance positive and negative particles. He proposed a model known as the 'plum pudding' model, in which atoms were described as a positively charged mass with an equal amount of negative charge in the form of electrons embedded in it. This model suggested that atoms are made of thousands of electrons swimming around in a nebulous mass of positive charge.