Assume the recommended single dose of an antihistamine for a child weighing between 18-23 lbs is 0.75 teaspoons (tsp). if 1.00 tsp contains 12.5 mg/5 ml of the active ingredient in the antihistamine, how many milligrams of active ingredient does the recommended dose for a child weighing between 18-23 lbs contain? assume that 1.00 tsp = 5 ml

The recommended dose for a child weighing between 18-23 lbs should contain 9.375 milligram of an active ingredient.

Explanation:

Recommended dose for a child weighing between 18-23 lbs:

= 0.75 table spoon  = 0.75 × 5 mL = 3.75 mL

Amount of active ingredient in 1 table spoon = 2.5 mg/5 ml

This means that in 5 ml of dose there is a 2.5 milligrams of an active ingredient.

Then active ingredient in 3.75 mL of dose:

The recommended dose for a child weighing between 18-23 lbs should contain 9.375 milligram of an active ingredient.

"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."