Is backbonding is possible in BF4- ? If no then why?

Solar energy is energy from the sun that is converted into thermal or energy. a. nuclear b. mechanical c. electrical d. chemical

Using the periodic table, complete the table to describe each atom. type in your answers.a ? b? c? d? e? f?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)