Which of the following sets belong to the sam period?

Options

A. Li,Na,K
B. Li,Mg,Ca
C. Ni,Cu,Zn
D. F,Cl,Br

Explanation

To determine which of the given sets of elements belong to the same period in the periodic table, follow these steps:

### Step 1: Understand the Periodic Table
The periodic table is organized into periods (horizontal rows) and groups (vertical columns). Each period contains elements that have the same number of electron shells.

### Step 2: Identify the Elements in Each Set
You need to identify the elements in each set provided in the question. For example, if the sets are:
- Set A: Lithium (Li), Sodium (Na), Potassium (K)
- Set B: Magnesium (Mg), Calcium (Ca), Strontium (Sr)
- Set C: Nickel (Ni), Copper (Cu), Zinc (Zn)
- Set D: Fluorine (F), Chlorine (Cl), Bromine (Br)

### Step 3: Locate Each Element on the Periodic Table
Using the periodic table, find the period number for each element:
- **Set A**:
- Lithium (Li) - Period 2
- Sodium (Na) - Period 3
- Potassium (K) - Period 4
- **Set B**:
- Magnesium (Mg) - Period 3
- Calcium (Ca) - Period 4
- Strontium (Sr) - Period 5
- **Set C**:
- Nickel (Ni) - Period 4
- Copper (Cu) - Period 4
- Zinc (Zn) - Period 4
- **Set D**:
- Fluorine (F) - Period 2
- Chlorine (Cl) - Period 3
- Bromine (Br) - Period 4

### Step 4: Compare the Periods
Now, compare the periods of the elements in each set:
- **Set A**: Different periods (2, 3, 4)
- **Set B**: Different periods (3, 4, 5)
- **Set C**: All elements are in Period 4
- **Set D**: Different periods (2, 3, 4)

### Step 5: Conclusion
The only set where all elements belong to the same period is **Set C** (Nickel, Copper, and Zinc), which are all in Period 4.

### Final Answer
The correct answer is **Set C: Nickel (Ni), Copper (Cu), Zinc (Zn)**, as they all belong to the same period (Period 4).

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