Halogens

a. group 1 elements
b. elements that make up the f -block
c. elements of the s and p-blocks
d. group 17 elements
e. entire set of d-block elements

The answer is directly the group 17 elements. Those are the ones that begin with Fluorine and Chlorine. They head the group of Halogens. Go down to see the next two -- Bromine (Br) and Iodine(I). All four are halogens. Whatever is in column 17 is a halogen.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3