What problems are produced by burning fossil fuels? what alternative resources could we use to produce electricity?

Which of the following units is not an official si unit

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.

What is a difference between a mixture of elements and a mixture of compounds