Please describe how we determine valence electrons in the main 8 octet groups, like how certain families have certain amounts. Explain, in complete sentences how we know things like Sodium has one valence electron and Chlorine has 7.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.

What relationship exists between an enzyme and a catalyst?