Why does the mass number for an element differ from the average atomic mass for the element?

Which compound is an exception to the octet rule? H2O HCl CCl4 ClF3

Type in the correct values to correctly represent the valence electron configuration of magnesium: AsB A = B =

Which of these is an example of a biotic factor? A Hot desert Sun B Mojave River C Arid desert air D Mojave grasshoppers

Consider the following three-step mechanism for a reaction: Cl2 (g) ⇌2Cl (g) Fast Cl (g) + CHCl3 (g) →HCl (g) + CCl3 (g) Slow Cl (g) + CCl3 (g) →CCl4 (g) Fast What is the overall reaction?

Charlie took 8 minutes to run a mile. His sister, Christina, took 13 minutes to run a mile. Which of the following is true?

The balanced equation for the generation of sugar from sunlight water and co2 is

Isotopes of the same element have different ... A. Positions on the periodic table b. atomic numbers C. Mass number

How many moles of O2 are needed to make 1.98 moles of SO3

How many protons are in the nucleus of isotopes L?

What is the empirical formula for a compound that contains 38.77% Cl and 61.23% O?