Chapter 4
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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Explain group 1,2,3
All are metals Can conduct electricity
Group 14 - 17
Non-metals
What are Group 18 elements also known as?
A: Inert gases or noble gases.
Name all the Group 18 elements.
Helium (He) Neon (Ne) Argon (Ar) Krypton (Kr) Xenon (Xe) Radon (Rn) Oganesson (Og).
What are the physical properties of Group 18 elements? 1. Water 2. Conduction 3. BP. MP 4. Attraction forces
Insoluble in water. Do not conduct electricity or heat. Boiling and melting points increase down the group. Van der Waals forces increase as atom size increases.
Why are noble gases chemically non-reactive?
A stable duplet electron arrangement with two valence electrons.
Why are noble gases chemically non-reactive?
A stable octet/ duplet electron arrangement with eight/two valence electrons.
Give two uses of helium.
Filling weather balloons. Oxygen tanks for divers.
Name one use of radon
Treating cancer.
What is neon used for?
Neon is used in advertising board lights.
List two uses of argon.
Filling electric bulbs. Providing an inert atmosphere for high-temperature welding.
Give two uses of krypton.
Flashlights for cameras. Lasers for eye retina treatment.
What are two uses of xenon?
Lighthouse lamps. Anesthesia.
How do boiling points of Group 18 elements change down the group?
Boiling points increase down the group due to stronger van der Waals forces.
What causes the increase in van der Waals forces in noble gases?
The increase in atom size down the group.
What is the group name for Group 1 elements?
Alkali metals, except for hydrogen
List the elements in Group 1.
Hydrogen (H) Lithium (Li) Sodium (Na) Potassium (K) Rubidium (Rb) Caesium (Cs) and Francium (Fr).
What is the general physical state of Group 1 elements?
They are soft metals.
Are alkali metals good conductors?
Yes, they are good conductors of heat and electricity.
What happens to the atomic radius of Group 1 elements as you go down the group?
The atomic radius increases.
What trend is observed in the melting point of Group 1 elements down the group?
The melting point decreases.
How does density change down Group 1?
Density increases as you move down the group.
How does density change down Group 1?
Density increases as you move down the group.
What happens when Group 1 elements react with water?
They produce hydrogen gas and an alkaline solution.