Periodic Table — Complete Question Bank (Class 9)
MCQs, Short Questions, Long Questions — ready to print or use online
MCQs — Multiple Choice Questions
Choose the correct option.
- Elements are arranged in the periodic table according to their:
a) Mass number b) Atomic number c) Density d) Volume - Number of periods in the modern periodic table is:
a) 5 b) 7 c) 10 d) 18 - Number of groups in the periodic table is:
a) 7 b) 10 c) 18 d) 20 - Group 1 elements are called:
a) Noble Gases b) Halogens c) Alkali Metals d) Transition Metals - Group 18 elements are known as:
a) Halogens b) Noble Gases c) Alkaline Earth Metals d) Metalloids - Which of the following is a halogen?
a) Na b) K c) Cl d) Ca - Helium belongs to which group?
a) Group 1 b) Group 17 c) Group 18 d) Group 2 - Lanthanides belong to:
a) Period 4 b) Period 5 c) Period 6 d) Period 7 - Elements in the same group have the same:
a) Mass number b) Valence electrons c) Density d) Neutrons - Sodium (Na) is present in:
a) Group 1 b) Group 2 c) Group 17 d) Group 18 - Which element is a noble gas?
a) N b) O c) Ne d) F - Metals are mostly located on the:
a) Left side b) Right side c) Top d) Bottom - Non–metals are mostly located on the:
a) Left b) Right c) Center d) Bottom - The horizontal rows in periodic table are called:
a) Groups b) Columns c) Periods d) Series - The vertical columns are called:
a) Periods b) Groups c) Blocks d) Rows
Toggle answers for MCQs
Answers: 1-b, 2-b, 3-c, 4-c, 5-b, 6-c, 7-c, 8-c, 9-b, 10-a, 11-c, 12-a, 13-b, 14-c, 15-b
Short Questions
Write brief answers (1–3 lines).
- What is the periodic table?
- Define group and period.
- What are alkali metals? Give two examples.
- What are halogens? Give two examples.
- What are noble gases? Give two examples.
- Write names of any four noble gases.
- What are transition metals? Give two examples.
- What are lanthanides?
- What are actinides?
- Why are Group 18 elements unreactive?
- What is the atomic number?
- Why do elements in the same group have similar properties?
- State Modern Periodic Law.
- What is meant by valency?
- What are metalloids? Give two examples.
- Write two differences between metals and non-metals.
- Why is hydrogen placed separately in the periodic table?
- What is meant by periodicity?
- Which group is the most reactive metal group?
- Which group is the most reactive non-metal group?
Show/Hide standard answers
Answers (summarized):
- A table arranging elements by increasing atomic number and similar properties.
- Group: vertical column; Period: horizontal row.
- Group 1 metals that form +1 ions (e.g., Na, K).
- Group 17 non-metals (e.g., Cl, F).
- Group 18 gases with full valence shells (e.g., Ne, Ar).
- Helium, Neon, Argon, Krypton.
- Elements in d-block (e.g., Fe, Cu).
- Elements in f-block of period 6 (lanthanum series).
- Elements in f-block of period 7 (actinium series).
- They have full valence shells so they are chemically inert.
- Number of protons in the nucleus of an atom.
- Same valence electron configuration leads to similar chemistry.
- Properties of elements are periodic functions of atomic number.
- Number of electrons an atom gains/loses/shares to become stable.
- Elements with properties between metals and non-metals (e.g., Si, Ge).
- Metals: lustrous, conductors. Non-metals: dull, poor conductors.
- Hydrogen has unique properties; behaves like group 1 or 17 in different cases.
- Repeating trends in properties across periods/groups.
- Group 1 (alkali metals).
- Group 17 (halogens).
Long Questions / Essay Questions
Answer in detail (4–8 marks each).
- Explain the modern periodic table and how elements are arranged in it.
- What are groups and periods? Explain with examples and give the significance of group numbers.
- Write characteristics and uses of alkali metals with examples.
- Describe properties and trends of halogens.
- Explain noble gases and state their industrial uses.
- Differentiate between metals, non-metals and metalloids with examples.
- Explain lanthanides and actinides: position, properties and important elements.
- What is periodicity? Explain the trends in atomic size and ionization energy across a period and down a group.
- Discuss the historical development of the periodic table (Dobereiner, Newlands, Mendeleev, modern table).
- Describe how electronic configuration is related to an element’s position in the periodic table.
Show/Hide model answers (short)
Model answer hints:
- Modern table: arranged by atomic number; groups with similar valence; periods show shell filling.
- Groups: same valence electrons; Periods: same outer shell number; group numbers indicate valence for main-group elements.
- Alkali metals: soft, react with water, store under oil; uses: Na in street lights, K in fertilizers.
- Halogens: diatomic in pure form, high reactivity decreases down the group; uses: disinfectants (Cl), photography (Br compounds).
- Noble gases: monoatomic, inert; uses: neon lights, Argon in welding, Helium for balloons and cryogenics.
- Metals vs non-metals: compare physical and chemical properties with examples.
- Lanthanides: similar reactivity, used in magnets, phosphors. Actinides: radioactive, nuclear fuels (U, Pu).
- Atomic size decreases across a period, increases down a group. Ionization energy increases across, decreases down.
- Historic steps: triads, octaves, Mendeleev’s table predicting elements, later corrected by atomic number.
- Electronic configuration determines block (s,p,d,f) and group/period placement.
Answer Key & Tips
Use this section as a quick-check while marking.
- MCQs answer list is included in the MCQ card.
- Encourage students to write definitions and short examples for short questions.
- For long questions, include diagrams (periodic table snippets), examples and trend tables to gain full marks.
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