SiH4 NH3 H2O CO2 SO2 CH2O CH4 BH3 PF5 XeF4 ClF3 XeF2 SF4 SF6 NO2- CO32- CN- I3- SF5- NH4+ a. Draw the Lewis Structure (be prepared to justify your Lewis structure and why you believe it is the correct structure, when you input your exam answers in the 40-minute exam answer submission file on blackboard. For instance, justification can be provided by showing/explaining formal charge calculations, as well as obeying octet rule and exceptions to octet rule, etc…) b. Identify the molecular geometry (shape) c. Identify the hybridization of the central atom d. State the bond angle for the following molecules or ions: H2O CO2 SO2 NH3 NH4 + CH4 BH3 e. Explain the difference between a sigma and pi bond. f. Identify the number of π bonds and σ bonds in the caffeine (C8H10N4O2) molecule below.

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.