What integer represents the total charge of 4 protons

4

Explanation:

+ 4 is the integer that represents the total charge of 4 protons because proton has a positive charge is known as cation so plus sign should be added to number of protons while on the other hand, for 4 electrons we -4 integer because electron has negative charge is known as anion so that's why plus sign is added with proton and negative sign is added to electron.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

it's filtration, but this is an assumption so my apologies if i got this