Question

during an experiment, lithium (li) was combined with fluorine (f) to form lithium fluoride 2li + f₂ → 2lif. it can be used in measuring radiation exposure, in batteries, and in dental treatments.

1. which type of matter (ecm) is lithium fluoride (2lif)? why?
2. which group on the periodic table is fluorine (f) located in?
3. how does fluorine react and why?
4. draw the atomic structure (model) of fluorine (f).

Explanation:

Step1: Identify matter type of lithium fluoride

Lithium (Li) is a metal and Fluorine (F) is a non - metal. They form an ionic bond by electron transfer. So, lithium fluoride is an ionic compound.

Step2: Locate Fluorine in Periodic Table

Fluorine has 7 valence electrons. Elements with 7 valence electrons are in Group 17 (halogens) of the Periodic Table.

Step3: Explain Fluorine's reactivity

Fluorine has 7 valence electrons and wants to gain 1 electron to achieve a stable octet. It is highly reactive as it readily accepts an electron from other elements.

Step4: Draw Fluorine's atomic structure

Fluorine has an atomic number of 9. It has 2 electrons in the first shell and 7 electrons in the second shell. Draw a nucleus with 9 protons and 10 neutrons (approximate), and two electron - shells with 2 and 7 electrons respectively.

Answer:

1. Ionic compound. Because lithium is a metal and fluorine is a non - metal and they form an ionic bond through electron transfer.
2. Group 17. As it has 7 valence electrons.
3. Fluorine readily gains 1 electron to achieve a stable octet configuration. It is highly reactive due to its strong desire to complete its outer shell.
4. Draw a nucleus with 9 protons and 10 neutrons (approximate). Draw two electron - shells: the first shell with 2 electrons and the second shell with 7 electrons.