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Química173Updated 19 Sept 20265 pages

Modelos Atòmics Explicats

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Saad Hayyat Parveen@saadhayyatparveen_fhtw
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¿Alguna vez te has preguntado de qué están hechas todas las cosas que te rodean? Los modelos atómicos nos ayudan a entender cómo está formada la materia, desde tu móvil hasta las estrellas. A lo largo de la historia, diferentes científicos han propuesto teorías cada vez más precisas sobre qué son y cómo funcionan los átomos .
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Los Primeros Pasos: Demócrito y Leucipo

Imagínate vivir hace más de 2.000 años y ser el primero en sugerir que todo está hecho de partículas diminutas. Eso es exactamente lo que hicieron Demócrito y Leucipo en el año 460 a.C.

Estos filósofos griegos fueron los primeros en decir que un átomo es la partícula más pequeña en que se puede dividir un elemento. Incluso fueron ellos quienes inventaron la palabra "átomo", que significa "indivisible".

Sin embargo, sus ideas no fueron populares en su época. La escuela continuista se opuso a sus teorías y durante más de 2.000 años, sus conceptos fueron ignorados. ¡Imagínate tener razón pero que nadie te crea durante milenios!

Dato curioso: La palabra "átomo" viene del griego y significa "que no se puede cortar".

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La Teoría de los Cuatro Elementos y Dalton

Durante muchos siglos, la gente creía en la teoría de los cuatro elementos: fuego, aire, tierra y agua. Estos se relacionaban con cuatro cualidades básicas: seco, caliente, frío y húmedo.

Todo cambió en 1766 cuando John Dalton decidió rescatar las ideas de Demócrito y Leucipo. Dalton propuso que la materia está formada por partículas esféricas, diminutas e invisibles llamadas átomos.

Su teoría decía algo revolucionario: todos los átomos del mismo elemento son exactamente iguales en todo. Esto significa que todos los átomos de hierro son idénticos entre sí, pero diferentes a los átomos de oxígeno.

Recuerda: Dalton fue el primero en dar una explicación científica sólida sobre los átomos, no solo filosófica.

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Descubriendo el Interior: Thomson y Rutherford

En 1897, Thomson hizo un descubrimiento increíble: los átomos no son sólidos como pelotas de billar. Descubrió que contienen electrones (partículas negativas) distribuidos en una masa de energía positiva, como las pasas en un pudín.

Pero la sorpresa más grande vino en 1911 con Rutherford. Él y su equipo bombardearon una lámina fina de oro con partículas alfa (positivas) y observaron algo asombroso.

La mayoría de las partículas atravesaban la lámina, pero algunas rebotaban. Esto le llevó a una conclusión revolucionaria: los átomos están casi completamente vacíos. El átomo tiene un núcleo central muy pequeño y denso, rodeado de mucho espacio vacío.

Piénsalo así: Si un átomo fuera del tamaño de un estadio de fútbol, el núcleo sería como una pelota de ping-pong en el centro.

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Los Modelos Modernos: Bohr y el Modelo Actual

En 1913, Niels Bohr aplicó la teoría cuántica para explicar cómo se comportan los átomos cuando emiten luz. Su idea principal era que la energía del electrón está cuantificada.

Esto significa que los electrones solo pueden ocupar ciertas órbitas o estados estacionarios alrededor del núcleo, cada uno con valores específicos de energía. Es como si solo pudieran "saltar" entre escalones fijos de una escalera.

El modelo actual va aún más lejos. Basado en la ecuación de Schrödinger, usa cuatro números cuánticos para describir completamente un electrón en un átomo. En lugar de órbitas definidas, los electrones forman "nubes de probabilidad" alrededor del núcleo.

Para exámenes: Recuerda que cada modelo científico mejoró el anterior añadiendo nuevos descubrimientos, no rechazándolo completamente.

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