The electronegativity of germanium is 1.8; that of bromine is 2.8 on the Pauling scale. Will they form an ionic bond?

The answer to your question is No.

Explanation:

Data

Electronegativity of Ge = 1.8

Electronegativity of Br = 2.8

The Ionic bond definition is the union of a metal and a nonmetal which difference of electronegativity is 1.7 or higher.

The Covalent bond definition is the union of two nonmetals which difference of electronegativity is lower than 1.7.

Calculate the difference of electronegativity between the Ge and Br.

               ΔE = 2.8 - 1.8

               ΔE = 1

This elements do not form an ionic bonding, they form a covalent bond.

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

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