Question

the halogens group
group #:
draw the example atom and make the outermost electron(s) in bold.
family members (by symbol and atomic #):
list 5 properties/trends of the members: 1
2
3
4
5
what does the word halogen mean?
what types of bonds do the halogens form?
go to www.periodictable.com and hover over each of the halogens. write down 2 or 3 interesting facts about them:
the noble gases group
group #:
draw the example atom and make the outermost electron(s) in bold.
family members (by symbol and atomic #):
list 5 uses of the members: 1
2
3
4
5
why are the nobel gases so unreactive?
what are some special facts about helium?
go to www.periodictable.com and hover over each of the noble gases. write down 2 or 3 interesting facts about them

Explanation:

• Halogen Group:
• Family members are Fluorine (F, 9), Chlorine (Cl, 17), Bromine (Br, 35), Iodine (I, 53), Astatine (At, 85).
• Properties/trends: High electronegativity, 7 valence - electrons, form salts with metals, are non - metals, reactivity decreases down the group.
• “Halogen” means “salt - former”.
• They form ionic bonds with metals and covalent bonds with non - metals.
• Interesting facts: Fluorine is the most reactive non - metal; Chlorine is used in water purification.
• Noble Gases Group (Group 18):
• Family members are Helium (He, 2), Neon (Ne, 10), Argon (Ar, 18), Krypton (Kr, 36), Xenon (Xe, 54), Radon (Rn, 86).
• Uses: Helium in balloons and airships; Neon in neon signs; Argon in light bulbs to prevent filament oxidation; Krypton in lasers; Xenon in high - intensity discharge lamps.
• They are unreactive because they have a full outer electron shell, giving them a stable electron configuration.
• Special facts about Helium: It is the second - lightest element and has the lowest boiling point of any element.
• Interesting facts from the website: Neon glows red - orange in a vacuum discharge tube; Argon is the third - most abundant gas in Earth's atmosphere.

Answer:

• Halogen Group:
• Family Members: F (9), Cl (17), Br (35), I (53), At (85)
• 5 properties/trends: High electronegativity, 7 valence electrons, form salts with metals, non - metals, reactivity decreases down the group
• “Halogen” meaning: Salt - former
• Bond types: Ionic with metals, covalent with non - metals
• Interesting facts: Fluorine is most reactive non - metal; Chlorine used in water purification
• Noble Gases Group (Group 18):
• Family Members: He (2), Ne (10), Ar (18), Kr (36), Xe (54), Rn (86)
• 5 uses: Helium in balloons/airships; Neon in neon signs; Argon in light bulbs; Krypton in lasers; Xenon in high - intensity discharge lamps
• Unreactivity reason: Full outer electron shell
• Special facts about Helium: Second - lightest element, lowest boiling point
• Interesting facts: Neon glows red - orange in vacuum discharge tube; Argon is third - most abundant gas in Earth's atmosphere