SSC CGL Science – Periodic Table & Chemical Bonding – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Periodic Table & Chemical Bonding – Level 1 · Warm-up · Tier I Level – 12 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
The modern periodic table has how many groups?

Correct Answer: B [18]

Explanation:

18 vertical groups and 7 periods.

2.  
Mendeleev arranged the elements in order of increasing:

Correct Answer: D [atomic mass]

Explanation:

Mendeleev (1869) used atomic mass; atomic number came with Moseley (1913).

3.  
The “law of octaves” was given by:

Correct Answer: A [John Newlands]

Explanation:

Newlands: every eighth element resembled the first, like musical notes.

4.  
The element with atomic number 11 belongs to group:

Correct Answer: C [1]

Explanation:

2, 8, 1 → one valence electron → group 1.

5.  
The most electronegative element is:

Correct Answer: A [Fluorine]

Explanation:

Electronegativity rises up and to the right; fluorine is the top.

6.  
Which of these is a noble gas?

Correct Answer: D [Argon]

Explanation:

Answer: Argon. Argon is in group 18.

7.  
The bond in sodium chloride is:

Correct Answer: C [ionic]

Explanation:

Na transfers one electron to Cl → Na⁺Cl⁻.

8.  
The number of covalent bonds between the two atoms in a nitrogen molecule (N₂) is:

Correct Answer: B [3]

Explanation:

Each N has 5 valence electrons and shares 3 → N≡N triple bond.

9.  
Which of these is a metalloid?

Correct Answer: D [Silicon]

Explanation:

Metalloids: B, Si, Ge, As, Sb, Te.

10.  
Diagram-basedThe shaded cell in this outline of periods 1–3 shows the element:

Correct Answer: B [Chlorine]

Explanation:

Period 3, group 17 → 2, 8, 7 → chlorine.

11.  
Fill in the blankElements in the same group have the same number of ___.

Correct Answer: A [valence electrons]

Explanation:

Group = same outer electrons; period = same number of shells.

12.  
Statement-basedWhich is/are correct?
I. Atomic size decreases across a period from left to right.
II. Metallic character decreases down a group.

Correct Answer: C [Only I]

Explanation:

Metallic character INCREASES down a group.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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