Question

1. write in the atomic number for each mg atom in model 1.
2. what are the mass numbers of the naturally occurring isotopes of magnesium shown in model 1?
3. do all of the atoms of magnesium in model 1 have the same atomic mass? explain.
4. for the sample of 20 atoms of magnesium shown in model 1, draw a table indicating the mass numbers of the three isotopes and the number of atoms of each isotope present.
5. which isotope of magnesium is the most common in model 1?
6. based on model 1 and the table you created in question 4, for every 10 atoms of magnesium, approximately how many atoms of each isotope will be found?

Explanation:

Step1: Recall atomic number of magnesium

The atomic number of magnesium (Mg) is a fixed property and is 12 for all Mg atoms.

Step2: Identify magnesium isotopes

The naturally - occurring isotopes of magnesium have mass numbers 24, 25, and 26.

Step3: Understand atomic mass concept

No, all atoms of magnesium do not have the same atomic mass because they are different isotopes. Isotopes have the same number of protons (same atomic number) but different numbers of neutrons, so they have different mass numbers and thus different atomic masses.

Step4: Create isotope - count table

Mass Number	Number of Atoms
25	Assume some value based on Model 1 (not given here, but if we had data we would fill it)
26	Assume some value based on Model 1 (not given here, but if we had data we would fill it)

Step5: Determine most common isotope

Based on the counts in the table from Step 4, the isotope with the highest count is the most common.

Step6: Calculate isotope counts per 10 atoms

If we know the counts from Step 4 for 20 atoms, we can scale down to find the number of atoms of each isotope per 10 atoms. For example, if there are \(x\) atoms of mass - number 24 in 20 atoms, then for 10 atoms it would be \(\frac{x}{2}\).

Answer:

1. 12
2. 24, 25, 26
3. No. Isotopes have different numbers of neutrons, so different atomic masses.
4. Table as shown above (values to be filled based on Model 1 data)
5. The isotope with the highest count in the table from Step 4.
6. Values calculated by scaling down the counts from Step 4 for 20 atoms to 10 atoms.