Question

the table below gives some characteristics of element y.

characteristics of element y	values
number of neutrons in a single atom	6
average atomic mass (grams/mole)	10.81

what is the identity of element y?
o c
o b
o na
o s

Explanation:

Step1: Recall mass - number formula

The mass number ($A$) is the sum of the number of protons ($p$) and neutrons ($n$), i.e., $A=p + n$.

Step2: Calculate number of protons

Given $A = 11$ and $n=6$. We can find the number of protons $p$ using the formula $p=A - n$. So, $p=11 - 6=5$.

Step3: Identify element by proton number

The number of protons determines the identity of an element. An element with 5 protons is Boron (B).

Answer:

B. B