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

Let's go through each question on the Periodic Table Packet #1 and evaluate the answers provided. I'll explain whether each answer is correct, provide corrections if needed, and give a clear explanation for each.

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1. Define a family.

Answer: *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.
- Example: Group 1 (alkali metals), Group 17 (halogens).

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2. What is a period?

Answer: *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).
- For example, Period 3 elements all have electrons in the first three energy levels (n=1, 2, 3).

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3. What is the symbol for the following elements?

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

All symbols are correct.

> Note: These are standard elemental symbols based on Latin or English names.

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4. What are the names of the following elements?

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

All names are correct.

> Note: Au comes from *Aurum* (Latin for gold).

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5. What period are the following elements in?

a. He (Helium) → 1 ✔
- Helium is in Period 1 (top row).

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

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

d. I (Iodine) → 5 ✔
- Iodine is in Period 5.

All correct.

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6. What group are the following elements in?

a. Sulfur (S) → 16 ✔
- Sulfur is in Group 16 (also called chalcogens).

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

c. Iodine (I) → 17 ✔
- Iodine is in Group 17 (halogens).

d. Fe (Iron) → 8 ✘
- Iron is in Group 8, but only in older notation.
- In the modern IUPAC system, iron is in Group 8 (transition metals), so this is acceptable depending on context.

✔ Acceptable — though sometimes written as "Group 8" or "Group 8B" in older systems.

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7. Give me an atom with the following characteristics.

a. Halogen → Cl ✔
- Chlorine is a halogen (Group 17). Other options: F, Br, I, At.

b. Chalcogen → O ✔
- Oxygen is a chalcogen (Group 16). Others: S, Se, Te.

c. Alkali metal → Li ✔
- Lithium is an alkali metal (Group 1). Others: Na, K, etc.

d. Boron → Si ✘
- This is incorrect.
- The question asks for an element that is a boron, which likely means in the boron group (Group 13).
- But Si (Silicon) is in Group 14.
- Correct answer should be B (Boron) or another Group 13 element like Al.

✘ Incorrect → Should be B (Boron) or Al.

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

f. Alkaline Earth metal → Mg ✔
- Magnesium is in Group 2 — alkaline earth metals. Correct.

g. Transition metal → Ti ✔
- Titanium is a transition metal (Groups 3–12). Correct.

h. Noble gas → Xe ✔
- Xenon is a noble gas (Group 18). Correct.

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✔ Summary of Corrections:

Only one error:

> 7d. Boron → Si ✘
> Correct Answer: B (Boron)

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✔ Final Review:

Most answers are correct and well-reasoned. The only mistake is in Question 7d.

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🔍 Explanation for Question 7d:

- The boron group refers to Group 13 of the periodic table.
- Elements in this group include: B (Boron), Al (Aluminum), Ga (Gallium), In (Indium), Tl (Thallium).
- Si (Silicon) is in Group 14 — it's a metalloid, not a boron-group element.
- So, the correct answer should be B (Boron), or any other Group 13 element.

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✔ Final Answer Key (with correction):

| Question | Correct Answer |
|--------|----------------|
| 7d | B (not Si) |

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✔ All other answers are correct and demonstrate a solid understanding of the periodic table!

Let me know if you'd like a printable version or help studying these concepts further!