Periodic Table Worksheet Answers Key | Exercises Chemistry | Docsity - Free Printable

Let's go through each question in the Periodic Table Packet #1 and evaluate the answers provided, then explain the correct solutions where necessary.

---

1. Define a family.

✔ Answer given: *A column – similar properties*
✔️ Correct!
- A family refers to a vertical column in the periodic table (also called a group).
- Elements in the same family have similar chemical properties because they have the same number of valence electrons.

---

2. What is a period?

✔ Answer given: *A row – same energy levels*
✔️ Correct!
- A period is a horizontal row in the periodic table.
- All elements in a period have the same number of electron shells (energy levels).

---

3. What is the symbol for the following elements?

a. Magnesium → Mg ✔
b. Potassium → K ✔
c. Iron → Fe ✔
d. Copper → Cu ✔
✔️ All correct!

---

4. What are the names of the following elements?

a. C → Carbon ✔
b. Cl → Chlorine ✔
c. Au → Gold ✔
d. Sr → Strontium ✔
✔️ All correct!

---

5. What period are the following elements in?

a. He → 1 ✔
- Helium is in Period 1, even though it's in Group 18 (noble gases).

b. Ge → 4 ✔
- Germanium (Ge) is in Period 4.

c. Rb → 5 ✔
- Rubidium is in Period 5.

d. I → 5 ✔
- Iodine is in Period 5.

✔️ All correct!

---

6. What group are the following elements in?

a. Sulfur → 16 ✔
- Sulfur is in Group 16 (also known as the chalcogens).

b. Ca → 2 ✔
- Calcium is in Group 2, alkaline earth metals.

c. Iodine → 17 ✔
- Iodine is in Group 17, halogens.

d. Fe → 8 ✘
✘ Incorrect.
- Iron (Fe) is a transition metal in Group 8 — but note: modern IUPAC naming places iron in Group 8, so technically this is acceptable depending on the system used.
- However, many textbooks still refer to transition metals by their block rather than group number. But Group 8 is correct under the current IUPAC convention.

🟢 So, Fe → Group 8 is correct if using the modern IUPAC system.

✔ Therefore, this answer is acceptable.

---

7. Give me an atom with the following characteristics.

a. Halogen → Cl ✔
- Chlorine (Cl) is a halogen (Group 17). Good example.

b. Chalcogen → O ✔
- Oxygen (O) is a chalcogen (Group 16). Correct.

c. Alkali metal → Li ✔
- Lithium (Li) is an alkali metal (Group 1). Correct.

d. Boron → Si ✘
✘ Incorrect.
- The question says "Boron" — but that’s an element name.
- It seems like it's asking for an element in the boron group (Group 13), or possibly a typo.
- But looking at context: likely meant "an element in the boron group".
- So, Si (silicon) is not in the boron group — it's in Group 14.
- Boron (B) itself would be correct.
- Or another element from Group 13: Al (aluminum).

✘ So, Si is wrong. Should be B or Al.

✔ Correct answer: B or Al

e. Lanthanide series → Eu ✔
- Europium (Eu) is a lanthanide. Correct.

f. Alkaline Earth metal → Mg ✔
- Magnesium is in Group 2. Correct.

g. Transition metal → Ti ✔
- Titanium (Ti) is a transition metal. Correct.

h. Noble gas → Xe ✔
- Xenon (Xe) is a noble gas. Correct.

---

✔ Summary of Corrections:

| Question | Answer Given | Correctness | Notes |
|--------|--------------|-------------|-------|
| 7d | Si | ✘ Incorrect | Silicon is Group 14, not boron group. Boron group = Group 13: B, Al, Ga, In, Tl. So should be B or Al. |

---

✔ Final Answer Key with Explanations:

#### 7d. Boron group element → Correct answer: B (Boron) or Al (Aluminum)

> 🔍 Explanation: The boron group is Group 13 of the periodic table. Elements include:
> - Boron (B)
> - Aluminum (Al)
> - Gallium (Ga)
> - Indium (In)
> - Thallium (Tl)

> Silicon (Si) is in Group 14, which is the carbon group, not boron group.

---

✔ Full Corrected Answer for Question 7:

a. Halogen → Cl
b. Chalcogen → O
c. Alkali metal → Li
d. Boron group → B (or Al)
e. Lanthanide → Eu
f. Alkaline Earth metal → Mg
g. Transition metal → Ti
h. Noble gas → Xe

---

🟩 Final Verdict:

Most answers are correct. Only Question 7d has an error. Replace Si with B or Al.

Let me know if you'd like this printed out or formatted for submission!