Select three elements from the first 20 and provide their atomic numbers, electron arrangements, and identify an alkali metal, halogen, and noble gas with one property each.

Question

Asked on April 23, 2026Chemistry

This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.

Accepted Answer · 2026-04-23T20:11:53.520Z

TASK 1: PRACTICAL - ATOMIC STRUCTURE AND PERIODICITY a) Select any three elements from the first 20 elements and: i) Write their atomic numbers. • Hydrogen (H): Atomic number = 1 • Carbon (C): Atomic number = 6 • Oxygen (O): Atomic number = 8 ii) Write their electron arrangement using s and p orbitals. • Hydrogen (H): 1s^1 • Carbon (C): 1s^2 2s^2 2p^2 • Oxygen (O): 1s^2 2s^2 2p^4 b) Identify one alkali metal, one halogen and one noble gas from the first 20 elements and state one property of each. | Category | Example | Property | | :---------- | :---------- | 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Accepted Answer · 2026-04-23T20:11:53.520Z

TASK 1: PRACTICAL - ATOMIC STRUCTURE AND PERIODICITY a) Select any three elements from the first 20 elements and: i) Write their atomic numbers. • Hydrogen (H): Atomic number = 1 • Carbon (C): Atomic number = 6 • Oxygen (O): Atomic number = 8 ii) Write their electron arrangement using s and p orbitals. • Hydrogen (H): 1s^1 • Carbon (C): 1s^2 2s^2 2p^2 • Oxygen (O): 1s^2 2s^2 2p^4 b) Identify one alkali metal, one halogen and one noble gas from the first 20 elements and state one property of each. | Category | Example | Property | | :---------- | :---------- | 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Select three elements from the first 20 and provide their atomic numbers, electron arrangements, and identify an alkali metal, halogen, and noble gas with one property each.

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Select three elements from the first 20 and provide their atomic numbers, electron arrangements, and identify an alkali metal, halogen, and noble gas with one property each.

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