Atomic Structure and Periodic Trends Quiz

Grade 10 · Science · Quiz

Test your knowledge of atomic structure, electron configuration, and periodic trends.

Questions

1. Which subatomic particle has a negative charge?

   1. Proton
   2. Neutron
   3. Electron
   4. Nucleus
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   Answer: Electron

   Electrons carry a negative charge (-1), protons are positive (+1), and neutrons have no charge.

2. Elements in the same group have the same number of valence electrons.

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   Answer: True

   Group number (for main-group elements) corresponds to the number of valence electrons, giving elements similar chemical behavior.

3. Which element has the electron configuration 1s² 2s² 2p⁶ 3s¹?

   1. Magnesium
   2. Sodium
   3. Aluminum
   4. Silicon
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   Answer: Sodium

   Sodium (Na, atomic number 11) has electron config 1s² 2s² 2p⁶ 3s¹, with one valence electron in the third shell.

4. The energy required to remove the outermost electron from a neutral atom is called ___ energy.

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   Answer: ionization

   Ionization energy is the energy needed to remove the most loosely held electron from a neutral gaseous atom.

5. Which of the following has the smallest atomic radius?

   1. Na
   2. Mg
   3. Al
   4. Cl
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   Answer: Cl

   Chlorine is farthest right among the options in Period 3; atomic radius decreases left to right due to increasing nuclear charge.

6. Nonmetals are found on the left side of the periodic table.

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   Answer: False

   Nonmetals are found on the right side of the periodic table; metals dominate the left and center.

7. How many valence electrons does sulfur (Group 16) have?

   1. 2
   2. 4
   3. 6
   4. 8
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   Answer: 6

   Sulfur is in Group 16, meaning it has 6 valence electrons in its outermost shell.

8. Atoms of the same element with different numbers of neutrons are called ___.

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   Answer: isotopes

   Isotopes are variants of the same element differing only in neutron count, which changes the mass number but not the atomic number.

9. Which property of fluorine makes it the most electronegative element?

   1. Large atomic radius
   2. Low ionization energy
   3. High nuclear charge and small size
   4. Many electron shells
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   Answer: High nuclear charge and small size

   Fluorine's small size and high nuclear charge (9 protons) create a strong pull on bonding electrons, making it the most electronegative element.

10. The mass number of an atom equals the number of protons plus the number of neutrons.

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    Answer: True

    Mass number = protons + neutrons. This is distinct from atomic number, which counts protons only.

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