Question

instructions
read and answer the following questions.
(a) define the term isotopes.
isotopes are _ of the same element that have the same number of protons but a different number of neutrons.
(b) naturally occurring element y consists of 85% $_{11}^{23}y$ and 15% $_{11}^{25}y$. give the number of protons, neutrons, and electrons in each isotope of element y.

isotope	mass #	atomic #	protons	neutrons	electrons
$_{11}^{23}y$	23	11	11	12	11
$_{11}^{25}y$	25	11	11	14	11

(c) determine the average mass number (average atomic mass) of naturally occurring element y.

isotope	% abundance	mass (amu)	mass contribution
x	=
x	=
x	=

|total|total:
now that you have completed the task, go to khan academy and complete the assigned tasks.

Explanation:

Step1: Identify the mass and abundance of each isotope

Isotope $^{23}_{11}Y$ has mass 23 amu and abundance 85% (or 0.85), isotope $^{25}_{11}Y$ has mass 25 amu and abundance 15% (or 0.15).

Step2: Calculate the mass - contribution of each isotope

For $^{23}_{11}Y$, mass - contribution = 23×0.85 = 19.55 amu. For $^{25}_{11}Y$, mass - contribution = 25×0.15 = 3.75 amu.

Step3: Calculate the average atomic mass

Average atomic mass = 19.55 + 3.75 = 23.3 amu.

Answer:

23.3 amu