Chemistry
Atoms of different elements have

Same number of electrons and neutrons
Different atomic number and same eletronic configu-ration
Same atomic number and same electronic configuration
Different atomic number and different number of valence electrons

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Chemistry
The main use of salt in the diet is to

produce in small amounts the hydrochloric acid required for the digestion of food
increase the solubility of food particles in water
ease the process of cooking
make the taste of food better

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