Información:

https://www.cancer.gov/espanol/publicaciones/diccionarios/diccionario-cancer/def/molecula 

https://www.significados.com/molecula/ 

https://www.products.pcc.eu/es/academy/valencia-de-los-elementos-quimicos/ 

https://academiacartablanca.es/blog/valencias-quimicas-definicion-tablas/ 

https://openstax.org/books/qu%C3%ADmica-2ed/pages/2-4-formulas-quimicas 

https://es.wikipedia.org/wiki/F%C3%B3rmula_qu%C3%ADmica 

https://www.univision.com/explora/como-se-forman-las-moleculas 

https://es.khanacademy.org/science/ap-chemistry/atoms-compounds-ions-ap/compounds-and-ions-ap/a/paul-article-2#:~:text=Cuando%20se%20combinan%20los%20%C3%A1tomos,de%20representar%20y%20dibujar%20mol%C3%A9culas 

https://www.coldelvalle.edu.mx/formulas-quimicas-y-para-que-sirven/ 

https://phet.colorado.edu/sims/html/states-of-matter/latest/states-of-matter_es.html 

Imágenes: 

https://concepto.de/wp-content/uploads/2018/08/Molecula1-e1535392280151.jpg 

https://clickmica.fundaciondescubre.es/files/2016/12/Mescaline_Structural_Formulae-copy-768x567.jpg 

https://concepto.de/wp-content/uploads/2018/01/valencia-en-quimica-e1546030372880.jpg 

https://static.wikia.nocookie.net/informatica-educativa-i-upn/images/9/94/Imagen_-_qu%C3%ADmica_inicio_.jpg/revision/latest/scale-to-width-down/319?cb=20211125153219&path-prefix=es 

https://i.pinimg.com/736x/e3/75/05/e37505a25836e356e063f8cd65fa5338.jpg 

https://www.lifeder.com/wp-content/uploads/2018/09/Capa-de-valencia-1.jpg 

https://www.todamateria.com/electrones-de-valencia/ 

https://www.abc.com.py/edicion-impresa/suplementos/escolar/estados-fisicos-de-la-materia-1215586.html 

https://concepto.de/formula-quimica/ 

Videos: 

https://www.youtube.com/watch?v=_SD92D2Drfs 

https://www.youtube.com/watch?v=-cbYK1oJsUo 

https://www.youtube.com/watch?v=PEIWCVc7F0g