What was observed that led to the arrangement of sixty-three already -known elements by increasing atomic weights in the periodic table? A. A repetition occurs in chemical and physical properties B. An atomic weight corresponds to the existing abundance C. The number of neutrons and protons increased by one. D. The chemical compounds formed by elements increased by one

2b2t

explanation:

2b2t

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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