Q1. Which metal is a liquid at room temperature?
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Answer: C. Mercury
Mercury is the only metal that is liquid at room temperature.
Chemistry - Periodic Table Questions for SSC CGL (with Answers)
10 Chemistry - Periodic Table MCQs from the General Awareness section, with answers and short explanations.
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Q2. The modern periodic table arranges elements in order of increasing:
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Answer: B. Atomic number
The modern periodic law states that properties are a periodic function of atomic number.
Q3. Halogens such as chlorine and bromine belong to which group?
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Answer: C. Group 17
Halogens (F, Cl, Br, I) belong to group 17.
Q4. How many groups are there in the modern periodic table?
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Answer: A. 18
The modern (long form) periodic table has 18 groups and 7 periods.
Q5. Which is the most electronegative element?
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Answer: D. Fluorine
Fluorine has the highest electronegativity of all elements.
Q6. Which of the following sets is one of Dobereiner's triads?
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Answer: B. Lithium, Sodium, Potassium
Li, Na and K form a triad: Na's atomic mass (23) is about the average of Li (7) and K (39).
Q7. Which of the following is a metalloid?
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Answer: D. Silicon
Silicon shows properties intermediate between metals and non-metals, so it is a metalloid.
Q8. Moving from left to right across a period, the atomic radius generally:
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Answer: A. Decreases
Increasing nuclear charge pulls the electrons closer, so atomic size decreases across a period.
Q9. The element Mendeleev called 'eka-aluminium' was later discovered and named:
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Answer: A. Gallium
Eka-aluminium was predicted by Mendeleev and later found to be gallium.
Q10. An element with atomic number 12 is placed in the modern periodic table in:
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Answer: C. Period 3, Group 2
Configuration 2, 8, 2 means 3 shells (period 3) and 2 valence electrons (group 2); this is magnesium.
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