period:
section a: groups in the periodic table (multiple choice – 5 questions)
1. which group in the periodic table contains the most reactive metals? a) group 1 (alkali metals) b) group 2 (alkaline earth metals) c) group 17 (halogens) d) group 18 (noble gases)
2. elements in group 17 are known as: a) noble gases b) transition metals c) halogens d) lanthanides
3. which group has elements with a full outer shell of electrons? a) group 1 b) group 2 c) group 17 d) group 18
4. which group contains elements that form +2 ions most commonly? a) group 1 b) group 2 c) group 13 d) group 17
5. which group contains elements that are all nonmetals? a) group 1 b) group 2 c) group 17 d) group 18
section b: element identification by atomic number (fill in the blank – no word bank) use the periodic table.
6. atomic number 6 → ______
7. atomic number 8 → ______
8. atomic number 11 → ______
9. atomic number 12 → ______
10. atomic number 17 → ______
section c: lewis dot structures / metals
instructions: draw the lewis dot structures for the following elements.
metals (3):
11. sodium (na)

Question

Accepted Answer

### Section A
1.
# Brief Explanations:
Group 1 (Alkali Metals) are the most reactive metals because they have one valence electron that is easily lost, making them highly reactive. Group 2 metals are less reactive than Group 1, Group 17 are non - metals (halogens) and are reactive non - metals, and Group 18 are noble gases with low reactivity.
# Answer:
a. Group 1 (Alkali Metals)

2.
# Brief Explanations:
Group 17 elements are known as Halogens. Noble Gases are in Group 18, Transition Metals are in the d - block (groups 3 - 12), and Lanthanides are a specific series of elements.
# Answer:
c. Halogens

3.
# Brief Explanations:
Group 18 (Noble Gases) have a full outer shell of electrons (octet or duplet for helium), which makes them stable. Group 1 has 1 valence electron, Group 2 has 2 valence electrons, and Group 17 has 7 valence electrons.
# Answer:
d. Group 18

4.
# Brief Explanations:
Group 2 elements have 2 valence electrons and tend to lose these 2 electrons to form +2 ions. Group 1 forms +1 ions, Group 13 forms +3 ions, and Group 17 is non - metals that tend to gain electrons.
# Answer:
b. Group 2

5.
# Brief Explanations:
Group 17 contains all non - metals (fluorine, chlorine, bromine, iodine, astatine). Group 1 and Group 2 are metals, and Group 18 has non - metals (noble gases) but also includes helium, neon etc. which are non - metals, but Group 17 is all non - metals.
# Answer:
c. Group 17

### Section B
6.
# Brief Explanations:
The element with atomic number 6 is carbon (C). Atomic number is equal to the number of protons, and carbon has 6 protons.
# Answer:
Carbon (or C)

7.
# Brief Explanations:
The element with atomic number 8 is oxygen (O). Oxygen has 8 protons, so its atomic number is 8.
# Answer:
Oxygen (or O)

8.
# Brief Explanations:
The element with atomic number 11 is sodium (Na). Sodium has 11 protons, so its atomic number is 11.
# Answer:
Sodium (or Na)

9.
# Brief Explanations:
The element with atomic number 12 is magnesium (Mg). Magnesium has 12 protons, so its atomic number is 12.
# Answer:
Magnesium (or Mg)

10.
# Brief Explanations:
The element with atomic number 17 is chlorine (Cl). Chlorine has 17 protons, so its atomic number is 17.
# Answer:
Chlorine (or Cl)

### Section C
11.
# Brief Explanations:
Sodium (Na) is in Group 1, so it has 1 valence electron. The Lewis dot structure for sodium is written as the symbol Na with one dot (representing the valence electron) around it, i.e., $	ext{Na}\cdot$
# Answer:
$	ext{Na}\cdot$ (The Lewis dot structure has the Na symbol with one dot representing the single valence electron)

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Section A

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