Free preview 2/15

Question 1
Which group of the periodic table do the halogens belong to?
No clue? Show me the answer
Correct answerCorrect!Incorrect
CGroup 17
Step-by-step walkthrough
Choose a solution method
Method #1Direct Approach
Step 1: Recall Group Definition
Halogens are defined as elements in Group 17 of the periodic table.
Step 2: Check Known Elements
Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I) are all Group 17 elements.
Step 3: Confirm Answer
The correct answer is Group 17.
Method #2Process of Elimination
Step 1: Eliminate Group 18
DGroup 18
Group 18 contains the noble gases (He, Ne, Ar), which are unreactive — halogens are highly reactive, so this is wrong.
Step 2: Eliminate Group 16
BGroup 16
Group 16 contains oxygen and sulfur (chalcogens), not the halogens.
Step 3: Eliminate Group 15
AGroup 15
Group 15 contains nitrogen and phosphorus (pnictogens), not the halogens.
Step 4: Select Remaining Option
By elimination, Group 17 is the correct answer.
Question 2
How many electrons does every halogen atom have in its outermost (valence) shell?
No clue? Show me the answer
Correct answerCorrect!Incorrect
C7
Step-by-step walkthrough
Choose a solution method
Method #1Direct Approach
Step 1: Recall Halogen Configuration
All halogens are in Group 17, meaning they have 7 electrons in their valence shell.
Step 2: Apply to Chlorine
Chlorine has the configuration 2, 8, 7 — confirming 7 outer electrons.
Step 3: State Answer
Every halogen has 7 valence electrons, making them one electron short of a full outer shell.
Method #2Process of Elimination
Step 1: Eliminate 8
D8
8 electrons in the outer shell would make a noble gas (full outer shell), not a halogen.
Step 2: Eliminate 6
B6
6 outer electrons describe Group 16 elements like oxygen and sulfur, not halogens.
Step 3: Eliminate 5
A5
5 outer electrons describe Group 15 elements like nitrogen.
Step 4: Select 7
Halogens in Group 17 must have 7 valence electrons — one short of a complete shell.

Free preview

13 more questions in this topic

Pick this up in your Library: it holds the whole topic, notes, cheatsheet and questions. Your answers here are kept on this device.

Step-by-step walkthrough

Step 1: Recall Group Definition

Step 2: Check Known Elements

Step 3: Confirm Answer

Step 1: Eliminate Group 18

Step 2: Eliminate Group 16

Step 3: Eliminate Group 15

Step 4: Select Remaining Option

Step-by-step walkthrough

Step 1: Recall Halogen Configuration

Step 2: Apply to Chlorine

Step 3: State Answer

Step 1: Eliminate 8

Step 2: Eliminate 6

Step 3: Eliminate 5

Step 4: Select 7

13 more questions in this topic