Question

use this information to write the element in isotope notation. 11 p+, 11 e-, 12 n0
11
na
22.99
what is the mass number?
? na
11

Explanation:

Step1: Recall mass - number formula

The mass number ($A$) of an atom is the sum of the number of protons ($p$) and neutrons ($n$). The formula is $A=p + n$.

Step2: Identify values of $p$ and $n$

We are given that the number of protons $p = 11$ and the number of neutrons $n=12$.

Step3: Calculate the mass number

Substitute the values into the formula: $A=11 + 12=23$.

Answer:

23