Chemistry: First 20 Elements Flashcards

First 20 Elements Overview

• Hydrogen (H): Simplest element with 1 proton, 1 electron, and no neutrons.
• Helium (He): Light noble gas consisting of 2 protons, 2 electrons, and 2 neutrons.
• Lithium (Li): Alkali metal featuring 3 protons, 3 electrons, and 4 neutrons.
• Beryllium (Be): Alkaline earth metal with 4 protons, 4 electrons, and 5 neutrons.
• Boron (B): A metalloid comprising 5 protons, 5 electrons, and 6 neutrons.
• Carbon (C): Fundamental element for life, consisting of 6 protons, 6 electrons, and 6 neutrons.
• Nitrogen (N): Essential component of amino acids; has 7 protons, 7 electrons, and 7 neutrons.
• Oxygen (O): Vital for respiration; contains 8 protons, 8 electrons, and 8 neutrons.
• Fluorine (F): Reactive halogen with 9 protons, 9 electrons, and 10 neutrons.
• Neon (Ne): Inert noble gas with 10 protons, 10 electrons, and 10 neutrons.

Continued Element Breakdown

• Sodium (Na): An alkali metal featuring 11 protons, 11 electrons, and 12 neutrons.
• Magnesium (Mg): An alkaline earth metal with 12 protons, 12 electrons, and 12 neutrons.
• Aluminium (Al): Common metal comprising 13 protons, 13 electrons, and 14 neutrons.
• Silicon (Si): A key semiconductor material with 14 protons, 14 electrons, and 14 neutrons.
• Phosphorus (P): Important for DNA and energy transfer; contains 15 protons, 15 electrons, and 16 neutrons.
• Sulfur (S): Essential for certain amino acids, featuring 16 protons, 16 electrons, and 16 neutrons.
• Chlorine (Cl): Reactive halogen with 17 protons, 17 electrons, and 18 neutrons.
• Argon (Ar): A colorless noble gas with 18 protons, 18 electrons, and 22 neutrons.
• Potassium (K): Key mineral for biological functions; includes 19 protons, 19 electrons, and 20 neutrons.
• Calcium (Ca): Crucial for bones and teeth, comprising 20 protons, 20 electrons, and 20 neutrons.