What is the main topic of this video?

• Electron configuration of Be2+ ion

• Properties of noble gases

• Formation of chemical bonds

• Periodic table trends

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What is the atomic number of beryllium?

• 8

• 6

• 4

• 2

How many electrons does a neutral beryllium atom have?

• 4

• 8

• 2

• 6

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Which orbital block does beryllium belong to?

• p-block

• d-block

• f-block

• s-block

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How many electrons can the 1s orbital hold?

• 2

• 4

• 1

• 3

What is the electron configuration for neutral beryllium?

• 1s1 2s1

• 1s2 2s1

• 1s2 2s2

• 1s1 2s2

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What happens to beryllium when it becomes Be2+?

• It loses two protons

• It gains two electrons

• It gains two protons

• It loses two electrons

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What is the electron configuration for Be2+ ion?

• 1s1

• 1s2

• 2s1

• 2s2

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Which noble gas has the same electron configuration as Be2+?

• Argon

• Neon

• Krypton

• Helium

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Why is the electron configuration 1s2 considered stable?

• It has more protons than electrons

• It has a half-filled outer shell

• It has an empty outer shell

• It has a full outer shell

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