General Science: Periodic Table & Elements

The Modern Periodic Table organizes all discovered chemical elements based on their Atomic Number. It was proposed by Henry Moseley, refining Mendeleev’s original work.

Structural Organization

• Periods & Groups: There are 7 horizontal periods and 18 vertical groups in the modern table.
• Group 1 (Alkali Metals): Highly reactive metals like Lithium and Sodium.
• Group 17 (Halogens): Highly reactive non-metals including Fluorine and Chlorine.
• Group 18 (Noble Gases): Chemically inert gases such as Helium, Neon, and Argon.

Key Trends and Facts

• Electronegativity: Generally increases from left to right across a period and decreases down a group.
• Liquid Elements: Mercury (metal) and Bromine (non-metal) are the only elements liquid at room temperature.
• Abundance: Hydrogen is the most abundant element in the Universe, while Nitrogen is the most abundant in Earth’s Atmosphere.

Question for you: Which element has the highest electrical conductivity among all the elements in the periodic table?

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