Question

by taking this checkpoint, you will check your understanding of the concepts youve been working take the checkpoint multiple times. only your highest score will be recorded in the gradebook. time, go back and review the lesson activities you struggled with before taking the checkpoint again assistance if you need extra help.
good luck!
note: to answer some of the questions, it may help to reference a periodic table

element	number of protons	number of neutrons	number of electrons
iodine (i)	53	74	53
francium (fr)	87	136	87
lead (pb)	82	125	82

which element in the table has the greatest atomic mass?

Explanation:

Step1: Recall atomic mass formula

Atomic mass (in atomic mass units) is approximately the sum of the number of protons and neutrons, i.e., \( \text{Atomic Mass} \approx \text{Number of Protons} + \text{Number of Neutrons} \).

Step2: Calculate atomic mass for copper

For copper (Cu): Number of protons = 29, Number of neutrons = 35.
Atomic mass \( \approx 29 + 35 = 64 \).

Step3: Calculate atomic mass for iodine

For iodine (I): Number of protons = 53, Number of neutrons = 74.
Atomic mass \( \approx 53 + 74 = 127 \).

Step4: Calculate atomic mass for francium

For francium (Fr): Number of protons = 87, Number of neutrons = 136.
Atomic mass \( \approx 87 + 136 = 223 \).

Step5: Calculate atomic mass for lead

For lead (Pb): Number of protons = 82, Number of neutrons = 125.
Atomic mass \( \approx 82 + 125 = 207 \).

Step6: Compare atomic masses

Compare the calculated atomic masses: 64 (Cu), 127 (I), 223 (Fr), 207 (Pb). The largest is 223, corresponding to francium.

Answer:

francium (Fr)