Question

The atomic number of Na is 11, F is 9 and Ne is 10. Why are Na and F are very reactive but not Ne.​

Answer 1

Explanation:

But Neon has 8 electrons in ints valence shell that means neon has completed its octet and already has an stable configuration. Now by adding or loosing one electron Neon will loose its stable configuration and that is why neon does mot show reactivity while Na and F will react to acquire stable configuration.

Answer 2

Given,

• Atomic number of Na is 11.
• Atomic number of F is 9.
• Atomic number of Ne is 10.

Question

Why are Na and F are very reactive but not Ne.?

Answer

$\longrightarrow$If we see the electronic configuration of both

• Na= 1s² 2s² 2p² 3s¹
• F= 1s² 2s² 2p⁵
• Ne= 1s² 2s² 2p⁶

$\longrightarrow$ We can see that sodium has 1 electron in its valences shell and to complete its octet and to acquire noble gas configuration it has to loose that electron.

While Fluorine has 7 electrons in its valence shell and needs to gain 1 electron to complete its octet and to acquire noble gas configuration.

But Neon has 8 electrons in ints valence shell that means neon has completed its octet and already has an stable configuration.

Now by adding or loosing one electron Neon will loose its stable configuration and that is why neon does mot show reactivity while Na and F will react to acquire stable configuration.

Hence,Na and F are very reactive but not Ne.

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