Understanding Reactivity in Elements

What is reactivity in the context of chemistry?

• Reactivity refers to the physical state of a substance.

• Reactivity is the ability of a substance to maintain its structure.

• Reactivity is the tendency of a substance to undergo chemical reactions.

• Reactivity is the measure of a substance's mass.

Why is sodium considered a reactive element?

• Sodium is inert and does not react with other elements.

• Sodium is highly reactive due to its single valence electron that it easily loses.

• Sodium is a noble gas, which are known for their lack of reactivity.

• Sodium has a full outer shell of electrons, making it stable.

What is the electron configuration of neon?

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶

• 1s² 2s² 2p⁴

• 1s² 2s² 2p⁵

How many electrons does sodium have?

• 10

• 12

• 8

• 11

What is the significance of a full valence shell?

• Atoms with a full valence shell can easily form bonds with any element.

• A full valence shell indicates an atom is unstable.

• Atoms with a full valence shell are stable and less reactive.

• Atoms with a full valence shell are highly reactive.

What group of elements does neon belong to?

• Halogens

• Alkaline metals

• Transition metals

• Noble gases

What are noble gases?

• Noble gases are highly reactive elements found in the atmosphere.

• Noble gases are metals that conduct electricity.

• Noble gases are inert gases that have a full valence shell, making them non-reactive.

• Noble gases are compounds formed by combining different elements.

What evidence can indicate a chemical reaction?

• Change in mass

• Formation of a solid layer on the surface

• Release of light without heat change

• Evidence of a chemical reaction includes color change, gas production, formation of a precipitate, and temperature change.

Why does neon not react with other elements?

• Neon forms compounds with other noble gases.

• Neon does not react with other elements because it has a complete outer electron shell, making it chemically stable.

• Neon reacts easily with metals due to its high reactivity.

• Neon has an incomplete outer electron shell, making it unstable.

What happens during a highly reactive substance's reaction?

• Highly reactive substances remain stable and do not change.

• They slowly dissolve in water without any reaction.

• Highly reactive substances react quickly, often explosively, producing new substances and releasing energy.

• They produce only heat without forming new substances.