To determine the correct arrangement of electrons in an atom of fluorine (F), we start by considering its atomic number. Fluorine has an atomic number of 9, which means it has 9 electrons.
Electrons in an atom are arranged in energy levels or shells around the nucleus. The first energy level can hold a maximum of 2 electrons, and the second energy level can hold a maximum of 8 electrons.
Here is a step-by-step arrangement of electrons for fluorine:
1. First Energy Level:
- The first energy level (1s) can hold up to 2 electrons. Hence, the first 2 electrons will occupy this level.
2. Second Energy Level:
- Fluorine has 9 electrons in total, so we place the remaining electrons in the next available energy level.
- After filling the first energy level with 2 electrons, we have 9 - 2 = 7 electrons left.
- These 7 electrons will occupy the second energy level (2s and 2p).
Let's verify each option with this information:
1. Option 1: There are two electrons in the first energy level and seven electrons in the second energy level.
- This matches our arrangement (2 electrons in the first level and 7 in the second).
2. Option 2: There are five electrons in the first energy level and two electrons in the second energy level.
- This does not match our arrangement. The first energy level can hold a maximum of 2 electrons.
3. Option 3: There are seven electrons in the first energy level and two electrons in the second energy level.
- This is incorrect as well, because the first energy level can only hold 2 electrons.
4. Option 4: There are two electrons in the first energy level and five electrons in the second energy level.
- This is incorrect because we established there are 7 electrons in the second energy level for fluorine.
The correct statement is:
There are two electrons in the first energy level and seven electrons in the second energy level.
