ygen atom have? two four six eight
Counting valence Electrons How many valence electrons does this oxygen atom have? two four six eight
The Correct Answer and Explanation is:
Correct Answer: Six (6) valence electrons
Explanation
Oxygen is a chemical element with the atomic number 8, meaning it has 8 protons in its nucleus and, in a neutral atom, also 8 electrons. These electrons are arranged in energy levels, or shells, around the nucleus.
The first energy level (also called the K shell) can hold a maximum of 2 electrons. The second energy level (the L shell) can hold up to 8 electrons. Oxygen’s electron configuration is 1s² 2s² 2p⁴, which means:
- 2 electrons are in the first shell (1s²), and
- 6 electrons are in the second shell (2s² 2p⁴).
The outermost shell—the second shell—is called the valence shell, and the electrons in this shell are called valence electrons. These are the electrons involved in chemical bonding. Since there are 2 electrons in the 2s orbital and 4 in the 2p orbital, oxygen has 6 valence electrons.
Understanding the number of valence electrons is important because it determines how an atom behaves in chemical reactions. Atoms tend to react in ways that allow them to fill their valence shell, often reaching a stable configuration like that of noble gases, which have 8 valence electrons (the octet rule).
Oxygen, with 6 valence electrons, needs 2 more to complete its octet. This is why oxygen tends to form two covalent bonds with other atoms (e.g., in water, H₂O, oxygen bonds with two hydrogen atoms). Each hydrogen atom shares one electron with oxygen, allowing oxygen to have 8 electrons in its valence shell.
In conclusion, an oxygen atom has six valence electrons, which influences its reactivity and bonding behavior in molecules and compounds.
