Name the following molecular compounds: (a) NF3 nitrogen tri fluoride (b) 1,07 di (select) hept oxide
The correct answer and explanation is :
Here are the correct names for the given molecular compounds:
(a) NF₃ – Nitrogen trifluoride
(b) I₂O₇ – Diiodine heptoxide
Explanation:
Molecular compounds (also known as covalent compounds) are named using a systematic nomenclature that follows these rules:
- Naming the First Element
- The first element in the formula is named using its full element name.
- If there is more than one atom of this element, a numerical prefix is added (except for “mono-” when it is the first element).
- Naming the Second Element
- The second element’s name is modified to end in “-ide.”
- A numerical prefix is always used to indicate the number of atoms of this element.
- Using Numerical Prefixes
- The prefixes used to indicate the number of atoms in the compound are:
- 1 = mono-
- 2 = di-
- 3 = tri-
- 4 = tetra-
- 5 = penta-
- 6 = hexa-
- 7 = hepta-
- 8 = octa-
- 9 = nona-
- 10 = deca-
(a) NF₃ – Nitrogen trifluoride
- “Nitrogen” is the first element.
- “Fluoride” is derived from “fluorine” and gets the “-ide” ending.
- Since there are three fluorine atoms, we use the prefix “tri-.”
(b) I₂O₇ – Diiodine heptoxide
- “Iodine” is the first element, and since there are two atoms, we use the prefix “di-.”
- “Oxide” is derived from “oxygen.”
- Since there are seven oxygen atoms, we use the prefix “hepta-.”
- The “a” in “hepta-” is dropped before “oxide” to make pronunciation smoother.
This systematic approach ensures consistency in naming molecular compounds, avoiding ambiguity in chemical communication.