In this lesson, you learned about the Bohr model of the atom. The Bohr model below shows a phosphorus (P) atom. Write a paragraph describing how many valence electrons the atom has and why Bohr models are still useful to predict bonding of atoms, even though Bohr models do not correctly show the location of electrons in an atom.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Define the kinetic molecular theory