The ratio of the lons in an ionic compound depends on the charges of the ions. The amount of positive charge must balance the amount of negative charge. For each compound, both the total positive charge and the total
negative charge will equal the LCM found in part B.
Determine the number of positive ions and the number of negative ions for each ionic compound in the table.
Use the lonic charges of each element you found in part A. The number of each ion times the charge on the lon
should equal the LCM determined for each cell in part B.
[# of ions of an element] * [lon charge) - least common multiple (LCM)
Drag each element's chemical symbol to the table to show how many lons are needed to balance the charges.
Each symbol will be used more than once. The first row is already completed for you.

indium, and thallium have three electrons i think

distance, luminosity, brightness, radius, chemical composition, and temperature

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.