Why is the atomic mass of many elements not a whole number? a. elements are unstable. b. an element may have isotopes with different numbers of neutrons. c. the atomic mass includes all the electrons. d. isotopes are always expressed in decimals.

Given the following equation: 8 H2 + S8 - - > 8H2S what is the molar relationship between H2 and H2S

How many protons neutrons and electrons do I need to add to get the element MN

Covalent bonds can be best described as

Balance the equation KHCO3 + H3PO4 arrow K2HPO4+H20 C02.

Which one of the following scenarios accurately describes a condition in which resonance can occur? A.

What two chemical mechanisms change pyruvate to acetyl-CoA in the pyruvate dehydrogenase complex? Group of answer choices a) Decarboxylation and condensation. b) Oxidation and decarboxylation. c) Condensation and dehydrogenation.

Which earth cycle does the suns energy drive

How many moles are in 10 grams of CaCl2?

Which is the correct formula for phosphorus pentachloride? PCl4 because a subscript of 4 indicates four Cl atoms PCl5 because a subscript of 5 indicates five Cl atoms P5Cl because a subscript of 5 indicates five P atoms P5Cl3 because a subscript of

Why are the elements in groups 3 to 12 often used to make dyes?