En dos isótonos, la suma de sus protones es 90 y la diferencia de sus números de masa es 2. Determinar para el isótono más ligero el número de electrones de su catión tetravalente.

**40** points asapessay questions (10 points possible) clear image of next, create your own scenario. it can be one of your own real experiences or one you make up. use imagery in your writing to give your instructor a the setting and an action taking pace in your writing explain the structure and functions of the skin at work in your scenario. !

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What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion