Periodic table wrksht ANSWER KEY - Name Date - Studocu - Free Printable

It looks like you've uploaded a worksheet titled "Reading the Periodic Table KEY" with various questions about the periodic table. Since I can't view images directly, I’ll help you solve and explain each question based on the text you provided.

Let’s go through each question one by one and provide accurate answers and explanations.

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1. List the atomic numbers of the elements in Period 2.

Answer:
3, 4, 5, 6, 7, 8, 9, 10

Explanation:
Period 2 consists of the second row of the periodic table, starting from lithium (Li) to neon (Ne). The atomic numbers are:
- Li: 3
- Be: 4
- B: 5
- C: 6
- N: 7
- O: 8
- F: 9
- Ne: 10

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2. List the symbols of the elements in Period 3.

Answer:
Na, Mg, Al, Si, P, S, Cl, Ar

Explanation:
Period 3 includes elements from sodium (Na) to argon (Ar), which are:
- Na (sodium)
- Mg (magnesium)
- Al (aluminum)
- Si (silicon)
- P (phosphorus)
- S (sulfur)
- Cl (chlorine)
- Ar (argon)

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3. Name the elements in Period 2 that are metals.

Answer:
Lithium (Li), Beryllium (Be)

Explanation:
In Period 2:
- Lithium (Li) and Beryllium (Be) are metals.
- Boron (B) is a metalloid.
- The rest (C, N, O, F, Ne) are nonmetals.

So only Li and Be are metals.

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4. Name the elements in Period 1 that are nonmetals.

Answer:
Hydrogen (H), Helium (He)

Explanation:
Period 1 has only two elements:
- Hydrogen (H): nonmetal
- Helium (He): noble gas (nonmetal)

Both are nonmetals.

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5. Which element in Period 3 has the least mass?

Answer:
Sodium (Na)

Explanation:
Atomic mass increases across a period from left to right. Sodium (Na) is the first element in Period 3 (atomic number 11), so it has the lowest atomic mass among them.

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6. Which element in Period 3 has the most mass?

Answer:
Argon (Ar)

Explanation:
Argon (Ar) is the last element in Period 3 (atomic number 18), so it has the highest atomic mass in that period.

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7. To which group/family do these belong?

#### a. Cobalt, molybdenum, tantalum
Answer: Transition metals

Explanation:
These are all transition metals located in the d-block of the periodic table.

#### b. Sodium, lithium, potassium
Answer: Alkali metals

Explanation:
All are in Group 1 (IA), known as alkali metals.

#### c. Silicon, germanium, tin
Answer: Metalloids (or Carbon group, but more accurately: Metals and metalloids)

Wait — let's clarify:

- Silicon (Si): metalloid
- Germanium (Ge): metalloid
- Tin (Sn): metal

But they are all in Group 14 (IV A), the carbon group.

So the best answer here is: Carbon group or Group 14

But since the question asks for family/group, and all three are in the same group:

Answer: Carbon group

#### d. Selenium, tellurium, polonium
Answer: Chalcogens (Group 16)

Explanation: These are all in Group 16 (VIA), known as chalcogens.

#### e. Magnesium, calcium, strontium
Answer: Alkaline earth metals

Explanation: All are in Group 2 (IIA), alkaline earth metals.

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8. Find iron on the periodic table.

#### a. What is the atomic number of iron?
Answer: 26

#### b. To which group does iron belong?
Answer: Transition metals

Explanation: Iron (Fe) is in Group 8 (or 8B in older notation), part of the transition metals.

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9. Name the elements that have properties similar to that of chlorine.

Answer: Fluorine, bromine, iodine, astatine, tennessine

Explanation:
Elements in the same group (Group 17, halogens) have similar chemical properties. Chlorine is in Group 17, so other halogens include:
- Fluorine (F)
- Bromine (Br)
- Iodine (I)
- Astatine (At)
- Tennessine (Ts)

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10. Fill in the chart below. The first row has been completed as an example.

| Element | Symbol | Atomic Number | Period | Group |
|--------|--------|----------------|--------|-------|
| oxygen | O | 8 | 2 | 16 |
| Krypton | Kr | 36 | 4 | 18 |
| gold | Au | 79 | 6 | 11 |
| calcium | Ca | 20 | 4 | 2 |
| manganese | Mn | 25 | 4 | 7 |

Explanation:

- Krypton (Kr):
- Atomic number: 36
- Period: 4 (row 4)
- Group: 18 (noble gases)

- Gold (Au):
- Atomic number: 79
- Period: 6
- Group: 11 (transition metals)

- Calcium (Ca):
- Atomic number: 20
- Period: 4
- Group: 2 (alkaline earth metals)

- Manganese (Mn):
- Atomic number: 25
- Period: 4
- Group: 7 (transition metals)

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✔ Final Answer Summary:

1. 3, 4, 5, 6, 7, 8, 9, 10
2. Na, Mg, Al, Si, P, S, Cl, Ar
3. Lithium, Beryllium
4. Hydrogen, Helium
5. Sodium (Na)
6. Argon (Ar)
7.
a. Transition metals
b. Alkali metals
c. Carbon group
d. Chalcogens
e. Alkaline earth metals
8.
a. 26
b. Transition metals
9. Fluorine, bromine, iodine, astatine, tennessine
10. Completed chart as above.

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