🧪Halogen vs Noble gas💡
Groups 17 and 18 are neighbors with opposite chemistry. One craves an electron, the other already has a full shell.
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🧪Halogen
- ✓Group 17, seven valence electrons
- ✓Highly reactive nonmetals
- ✓Gains one electron to form -1 ions
- ✓Forms salts with metals (halides)
- ✓Examples: fluorine, chlorine, iodine
💡Noble gas
- ✓Group 18, full valence shell
- ✓Inert and almost unreactive
- ✓Does not normally form ions
- ✓Exists as single, stable atoms
- ✓Examples: helium, neon, argon
Verdict
Halogens are one electron short of stability and so are very reactive; noble gases are already complete and almost inert. They sit one column apart for that reason.
Frequently asked
Why are noble gases unreactive?+
Their outer electron shell is already full, so they have no drive to gain, lose or share electrons.
Why are halogens so reactive?+
They need just one more electron to fill their shell, making them eager to react.
What ion do halogens form?+
Halogens gain one electron to form -1 anions called halides.
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