Question

part b: completion
write the correct term in the blank to complete each sentence below.

1. positively charged particles in an atom are called
2. two atoms of uranium that differ in their number of neutrons are called
3. the chemical formula of a compound formed with boron and fluorine is

Explanation:

1. Protons are the positively - charged particles in an atom.
2. Isotopes are atoms of the same element (same number of protons) that differ in the number of neutrons.
3. Boron has a valence of + 3 and fluorine has a valence of - 1. Using the criss - cross method (valence numbers as sub - scripts), the chemical formula of the compound formed is \(BF_{3}\).

Answer:

1. protons
2. isotopes
3. \(BF_{3}\)