19 ¿Cuál de las siguientes representa una reacción química sencilla?
(1 Point)
al separar el agua de la arena mediante un embudo
al preparar caramelo a partir de azúcar y agua
cuando mezclamos vinagre con agua en un vaso de precipitado
cuando evaporamos el agua en una mezcla de agua salada
20​

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

Will mark brainliest how many electrons can be held in the energy level n = 4?