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Quizzes > Science

First 20 Elements Quiz: Test Names, Symbols, and Atomic Numbers

Quick elements 1-20 quiz with instant results and helpful review tips.

Editorial: Review CompletedCreated By: Casi GrayUpdated Aug 26, 2025
Difficulty: Moderate
Grade: Grade 7
Study OutcomesCheat Sheet
Colorful paper art promoting the Elements 1-20 Challenge quiz for high school students.

This quiz helps you master the first 20 elements-names, symbols, and atomic numbers-and shows what to review with instant results. To go further, try the first 40 elements quiz or the first 36 elements quiz, or broaden your knowledge with a periodic table of elements quiz.

Which element with atomic number 1 is the lightest element in the periodic table?
Hydrogen
Lithium
Beryllium
Helium
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Which symbol represents carbon among the first 20 elements?
Co
Ca
C
Cr
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Which of the first 20 elements is classified as a halogen?
Magnesium
Chlorine
Oxygen
Neon
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Among elements 1-20, which is a noble gas used in lighting?
Fluorine
Nitrogen
Phosphorus
Neon
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Which first-20 element is a metalloid widely used in computer chips?
Silicon
Sodium
Calcium
Argon
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Which of these first-20 elements makes up the largest fraction of Earths atmosphere?
Nitrogen
Argon
Oxygen
Carbon
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Which element in the first 20 commonly forms a 2+ ion in ionic compounds like CaCl2?
Calcium
Chlorine
Aluminum
Sodium
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Which element among the first 20 is stored under oil due to its high reactivity with air and water?
Calcium
Aluminum
Silicon
Sodium
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Which pair of elements are both in period 2 of the periodic table?
Lithium and Neon
Magnesium and Argon
Sodium and Neon
Boron and Sodium
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Which of the first 20 elements forms a passivating oxide layer that protects it from further corrosion?
Aluminum
Magnesium
Calcium
Carbon
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Which first-20 element is commonly identified by its bright yellow flame test?
Calcium
Beryllium
Sodium
Aluminum
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Which first-20 element has multiple allotropes including white and red forms?
Sulfur
Phosphorus
Argon
Chlorine
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Which compound is formed when magnesium reacts completely with oxygen?
Mg2O
Mg2O3
MgO2
MgO
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Which first-20 element was first identified in the spectrum of the Sun before being found on Earth?
Oxygen
Nitrogen
Helium
Neon
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In carbon dioxide, what is the oxidation state of carbon?
+4
0
+2
-4
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Which element among the first 20 has the highest first ionization energy?
Neon
Hydrogen
Fluorine
Helium
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Which first-20 element is most abundant in Earths crust by mass?
Oxygen
Silicon
Aluminum
Calcium
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Which of the following first-20 elements is LEAST electronegative?
Magnesium
Calcium
Sodium
Lithium
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Which first-20 element is commonly found in bones as part of hydroxyapatite Ca5(PO4)3(OH)?
Argon
Boron
Chlorine
Phosphorus
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Which of these first-20 elements is commonly used as a doping element with silicon to make p-type semiconductors?
Argon
Neon
Sodium
Boron
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0

Study Outcomes

  1. Identify the names, symbols, and atomic numbers of the first twenty elements.
  2. Analyze periodic trends and patterns among the elements.
  3. Describe the physical and chemical properties characteristic of each element.
  4. Apply foundational knowledge to compare and contrast element behaviors.
  5. Evaluate areas of strength and improvement in understanding the periodic table fundamentals.

Periodic Table Quiz: First 20 Elements Cheat Sheet

  1. Memorize the First 20 Elements - Start by getting cozy with the symbols and atomic numbers of Hydrogen through Calcium. Use flashcards, songs, or a quick daily quiz to lock them into your long‑term memory.
  2. Use Mnemonic Devices - Turn that jumble of element names into a fun sentence you won't forget. Try "Hi He Lies Because Boring Chemistry Needs Our Full New Nation Might Also Sign Peace Security Clause A King Can" and watch the symbols stick!
  3. Understand Element Properties - Group metals, nonmetals, and metalloids by shared traits: conductivity, state at room temperature, and reactivity. Seeing patterns makes it way easier to predict how elements behave in real experiments.
  4. Learn Electron Configurations - Dive into the 1s² 2s² 2p² breakdown for Carbon and beyond. Knowing where electrons live helps you forecast bonding, valence electrons, and molecule shapes like a true chemistry whiz.
  5. Recognize Periodic Trends - Track how electronegativity, atomic radius, and ionization energy shift across periods and down groups. Spotting these trends lets you predict which elements will be energetic reaction partners.
  6. Practice Balancing Equations - Write out simple reactions like 2Na + Cl₂ → 2NaCl to master atom counting. Balancing equations keeps you sharp and shows real‑world connections between elements and compounds.
  7. Explore Real‑World Uses - From Helium in party balloons to Silicon in smartphones, every element has a quirky role in daily life. Investigating practical applications makes chemistry feel relevant and exciting.
  8. Grasp Biological Significance - Calcium builds strong bones, while Iron ferries oxygen in your blood. Linking elements to living systems transforms abstract facts into meaningful knowledge you'll actually remember.
  9. Study Historical Discoveries - Trace how Helium was spotted in solar spectra before Earth samples were found, or how early chemists named elements after gods and places. History adds a storytelling twist to memorization.
  10. Use Songs and Videos - Hook into catchy periodic table tunes and animated explainers. Multimedia resources turn memorizing 20+ elements into a sing‑along adventure rather than a chore.
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