Questions: How many valence electrons does an atom of boron, Z=5, have?

Transcript text: d. How many valence electrons does an atom of boron, $Z=5$, have? one two three

Solution

Solution Steps

Step 1: Determine the Atomic Number and Electron Configuration

Boron has an atomic number $ Z = 5 $. This means a neutral boron atom has 5 electrons. The electron configuration of boron is $ 1s^2 2s^2 2p^1 $.

Step 2: Identify the Valence Electrons

Valence electrons are the electrons in the outermost shell of an atom. For boron, the outermost shell is the second shell, which contains the $ 2s^2 2p^1 $ electrons.

Step 3: Count the Valence Electrons

In the second shell, boron has 2 electrons in the $ 2s $ orbital and 1 electron in the $ 2p $ orbital, making a total of 3 valence electrons.

Final Answer

$\boxed{\text{three}}$

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