Question

Comparing element number 15 to element number 9 on the periodic table. Choose whether the following statements are true or false. (3 points) True False Element number 15 has a higher reactivity than element number 9. Element number 9 has more VALENCE electrons than element number 15. Both element number 9 and element number 15 gain electrons to form negative ions.

Answer 1

Let's first identify the elements by their atomic numbers:

• Element number 9 is Fluorine (F).
• Element number 15 is Phosphorus (P).

Now we can evaluate each statement:

1. Element number 15 has a higher reactivity than element number 9.
   False - Fluorine is one of the most reactive elements, especially among nonmetals, while phosphorus is less reactive compared to fluorine.

2. Element number 9 has more VALENCE electrons than element number 15.
   False - Fluorine (element 9) has 7 valence electrons (as it is in Group 17), while phosphorus (element 15) has 5 valence electrons (as it is in Group 15).

3. Both element number 9 and element number 15 gain electrons to form negative ions.
   False - Fluorine gains one electron to form the fluoride ion (F⁻), but phosphorus typically does not form negative ions in the same way; it can share electrons or form covalent bonds rather than simply gaining electrons to become negatively charged.

In summary:

1. False
2. False
3. False