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The table below gives some characteristics of element [tex]$Y$[/tex].

\begin{tabular}{|l|l|}
\hline
Characteristics of element [tex]$Y$[/tex] & Values \\
\hline
Mass number & 11 \\
\hline
Number of neutrons in a single atom & 6 \\
\hline
Average atomic mass (grams/mole) & 10.81 \\
\hline
\end{tabular}

What is the identity of element [tex]$Y$[/tex]?

A. C
B. B
C. Na
D. S


Sagot :

To determine the identity of element [tex]\( Y \)[/tex], we need to follow these steps:

1. Determine the Atomic Number:
- The mass number of element [tex]\( Y \)[/tex] is given as 11.
- The number of neutrons in a single atom is given as 6.
- The atomic number can be calculated by subtracting the number of neutrons from the mass number:
[tex]\[ \text{Atomic Number} = \text{Mass Number} - \text{Number of Neutrons} \][/tex]
Substituting the given values:
[tex]\[ \text{Atomic Number} = 11 - 6 = 5 \][/tex]

2. Identify the Element Based on the Atomic Number:
- The atomic number uniquely identifies an element on the periodic table.
- An atomic number of 5 corresponds to the element Boron, which is denoted by the symbol [tex]\( \text{B} \)[/tex].

Thus, the identity of element [tex]\( Y \)[/tex] is Boron ([tex]\(\text{B}\)[/tex]). Therefore, the correct answer is:

[tex]\[ \boxed{\text{B}} \][/tex]
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