Periodic Classification of Elements (10 Science)
The periodic table organizes elements based on their atomic number and chemical properties. Understanding periodic trends helps predict element behavior an
TL;DR: The periodic table organizes elements based on their atomic number and chemical properties. Understanding periodic trends helps predict element behavi…
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The periodic table organizes elements based on their atomic number and chemical properties. Understanding periodic trends helps predict element behavior an
Periodic Classification of Elements MCQs with Answers & Explanations
Q1. Who arranged the periodic table by atomic number?
- Dmitri Mendeleev
- Henry Moseley ✓ (correct)
- John Newlands
- Julius Lothar Meyer
Q2. Elements in the same group of the periodic table have:
- Same atomic number
- Same number of valence electrons ✓ (correct)
- Same atomic mass
- Same number of shells
Q3. Which of the following is a property of metals?
- Poor conductors of electricity
- Brittle
- Good conductors of heat and electricity ✓ (correct)
- Non-lustrous
Q4. The element with atomic number 6 is:
- Nitrogen
- Oxygen
- Carbon ✓ (correct)
- Boron
Q5. Across a period in the periodic table, atomic radius:
- Increases
- Decreases ✓ (correct)
- Remains constant
- Increases then decreases
Q6. Which of the following is a halogen?
- Oxygen
- Nitrogen
- Fluorine ✓ (correct)
- Helium
Q7. Noble gases have a valence shell that is:
- Half full
- Completely full ✓ (correct)
- Empty
- Has one electron
Q8. Electronegativity increases across a period and:
- Increases down a group
- Decreases down a group ✓ (correct)
- Remains constant down a group
- Increases then decreases down a group
Q9. Which element is a non-metal located in Group 15?
- Phosphorus ✓ (correct)
- Sulfur
- Chlorine
- Argon
Q10. The first ionization energy is the energy required to:
- Break a bond between atoms
- Add an electron to an atom
- Remove one electron from an atom ✓ (correct)
- Melt a solid
Frequently Asked Questions
What are the differences between metals, non-metals, and metalloids?
Metals are good conductors with luster and malleability. Non-metals are poor conductors and form covalent bonds. Metalloids have properties intermediate between metals and non-metals.
How did Mendeleev predict the properties of undiscovered elements?
Mendeleev arranged elements by atomic mass and left gaps for unknown elements, predicting their properties based on neighboring elements' characteristics. When gallium, scandium, and germanium were discovered, their properties closely matched his predictions.
More 10 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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