Chemistry Notes Ssc Jun 2026

Positively charged. Discovered by Ernest Rutherford (though Goldstein observed canal rays). Neutron: Neutral charge. Discovered by James Chadwick . Key Atomic Terms Atomic Number ( ): Number of protons in the nucleus of an atom. Mass Number ( ): Total number of protons and neutrons in the nucleus.

Focus on the first 20 elements, their symbols, atomic numbers, and whether they are metals, non-metals, or noble gases.

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| Property | Metals | Non-metals | |----------|--------|-------------| | Luster | Shiny | Dull | | Conductivity | Good | Poor | | Malleability | Yes | No | | Ductility | Yes | No | | Oxide nature | Basic | Acidic | Positively charged

Heterogeneous Mixture: Non-uniform composition; components remain distinct (e.g., Muddy water, Chalk in water). 2. Atomic Structure

Noble Gases (Inert gases like Helium, Neon, Argon). Trends: Atomic size decreases across a period (left to right). Electronegativity increases across a period. 4. Chemical Bonding and Reactions Ionic Bond: Transfer of electrons (e.g., NaCl). Covalent Bond: Sharing of electrons (e.g., H2Ocap H sub 2 cap O Oxidation vs. Reduction: Oxidation is the loss of electrons/gain of oxygen. Reduction is the gain of electrons/loss of oxygen. Redox Reaction: When both happen simultaneously. 5. Acids, Bases, and Salts This is a high-yield topic for SSC exams. Acids: Sour taste, turn blue litmus red, pH < 7. Discovered by James Chadwick

: Use memory tricks for the periodic table or the reactivity series of metals.

Answer: Sodium Chloride ( Which gas is known as Laughing Gas? Answer: Nitrous Oxide (

An anaerobic biological process converting sugar into alcohol using yeast.