Question

name: partners name(s): period: 1) how many protons does an atom of aluminum (al) have? 2) what chemical symbol corresponds to the element that has 17 protons? 3) what element has 42 protons? 4) what is the chemical symbol of the element that has 34 protons? 5) what element has 33 protons for all of its ions, isotopes, and atoms? 6) how many protons does an ion of phosphorus have? 7) an atom has an atomic number of 12. what is the chemical symbol? 8) an ion of an element with 26 protons has what chemical symbol? 9) an isotope of an element with the chemical symbol, w, has how many protons? 10) what is the atomic number of an element if one of its isotopes has 25 protons?

Explanation:

Step1: Recall atomic - number property

The number of protons in an atom is equal to its atomic number. Aluminum (Al) has an atomic number of 13. So, an atom of aluminum has 13 protons.

Step2: Identify element by protons

The element with 17 protons has an atomic number of 17, which is Chlorine with the chemical symbol Cl.

Step3: Find element by atomic number

The element with 42 protons has an atomic number of 42, which is Molybdenum (Mo).

Step4: Determine chemical symbol by protons

The element with 34 protons has an atomic number of 34, which is Selenium with the chemical symbol Se.

Step5: Identify element by proton count

The element with 33 protons for all its ions, isotopes, and atoms is Arsenic (As).

Step6: Proton - count in ion

An ion of an element has the same number of protons as the neutral atom. Phosphorus has an atomic number of 15, so an ion of phosphorus has 15 protons.

Step7: Find symbol by atomic number

An atom with an atomic number of 12 is Magnesium with the chemical symbol Mg.

Step8: Determine symbol by proton count

The element with 26 protons is Iron (Fe), and an ion of iron also has the chemical symbol Fe.

Step9: Protons in isotope

The chemical symbol W stands for Tungsten. Tungsten has an atomic number of 74, so an isotope of tungsten has 74 protons.

Step10: Atomic number from protons

The atomic number of an element is equal to the number of protons in its atoms. If an isotope has 25 protons, the atomic number of the element is 25, which is Manganese (Mn).

Answer:

1. 13
2. Cl
3. Molybdenum (Mo)
4. Se
5. Arsenic (As)
6. 15
7. Mg
8. Fe
9. 74
10. 25