Let's determine the identity of element [tex]\( Y \)[/tex] using the information provided in the table.
1. Mass Number and Number of Neutrons:
- The mass number of element [tex]\( Y \)[/tex] is given as 11.
- The number of neutrons in a single atom of element [tex]\( Y \)[/tex] is given as 6.
2. Calculate the Number of Protons:
- The mass number (A) of an element is the sum of the number of protons (Z) and the number of neutrons (N).
- Given:
[tex]\[
\text{Mass number} = \text{Number of protons} + \text{Number of neutrons}
\][/tex]
[tex]\[
11 = \text{Number of protons} + 6
\][/tex]
- By subtracting the number of neutrons from the mass number:
[tex]\[
\text{Number of protons} = 11 - 6 = 5
\][/tex]
3. Element Identification:
- The number of protons (also known as the atomic number) determines the identity of the element.
- An element with 5 protons is Boron (B).
4. Verification with Average Atomic Mass:
- The given average atomic mass is 10.81 grams/mole.
- This is consistent with the average atomic mass of Boron (which is approximately 10.81 grams/mole).
Therefore, based on the given characteristics, the identity of element [tex]\( Y \)[/tex] is Boron, which is represented by the symbol [tex]\( B \)[/tex].
