Level 1 — RecognitionPeriodic Table — First Look

Periodic Table — First Look

30 marksprintable — key stays hidden on paper

Level 1: Recognition

Time: 20 minutes Total Marks: 30

Section A — Multiple Choice (1 mark each)

Choose the single best answer.

Q1. Mendeleev arranged elements in his periodic table on the basis of increasing: (a) atomic number (b) atomic mass (c) number of neutrons (d) density

Q2. The modern periodic law states that properties of elements are a periodic function of their: (a) atomic mass (b) atomic radius (c) atomic number (d) valency

Q3. How many groups are there in the modern periodic table? (a) 7 (b) 8 (c) 16 (d) 18

Q4. How many periods are present in the modern periodic table? (a) 7 (b) 8 (c) 9 (d) 18

Q5. The element with symbol Na is: (a) Nitrogen (b) Sodium (c) Neon (d) Nickel

Q6. Which of the following is a metalloid? (a) Sulphur (b) Silicon (c) Sodium (d) Chlorine

Q7. Elements of Group 1 (except hydrogen) are called: (a) halogens (b) noble gases (c) alkali metals (d) alkaline earth metals

Q8. The block to which element with electronic configuration ending in $np^x$ belongs is the: (a) s-block (b) p-block (c) d-block (d) f-block

Q9. The correct symbol for Potassium is: (a) P (b) Po (c) K (d) Pt

Q10. Which of these is a typical property of non-metals? (a) good conductor of heat (b) malleable (c) generally brittle when solid (d) lustrous

Section B — Matching (1 mark each, 6 marks total)

Q11. Match the element in Column I with its symbol in Column II.

Column I (Element)	Column II (Symbol)
(i) Iron	(A) Ca
(ii) Calcium	(B) Fe
(iii) Copper	(C) He
(iv) Helium	(D) Cu

Q12. Match Column I with Column II.

Column I	Column II
(i) Group 18	(P) Alkali metals
(ii) Group 1	(Q) Halogens
(iii) Group 17	(R) Noble gases
(iv) Group 2	(S) Alkaline earth metals

Section C — True / False with justification (2 marks each)

State True or False (1 mark) and give a one-line reason (1 mark).

Q13. In Mendeleev's table, some elements were placed out of strict mass order.

Q14. Metalloids show properties of both metals and non-metals.

Q15. The symbol of Nitrogen is Ni.

Q16. All elements in the same period have the same number of valence electrons.

Q17. Modern periodic law removed the anomaly of the position of certain isotopes/pairs seen in Mendeleev's table.

Q18. Hydrogen is definitely placed in Group 17 in the modern periodic table.

Answer keyMark scheme & solutions

Section A (10 × 1 = 10 marks)

Q1 — (b) atomic mass. Mendeleev's original arrangement used increasing atomic mass. (1)

Q2 — (c) atomic number. Moseley's work established atomic number as the fundamental property. (1)

Q3 — (d) 18. Modern table has 18 vertical columns (groups). (1)

Q4 — (a) 7. There are 7 horizontal rows (periods). (1)

Q5 — (b) Sodium. Na = Natrium = Sodium. (1)

Q6 — (b) Silicon. Si is a metalloid; S, Cl are non-metals, Na is a metal. (1)

Q7 — (c) alkali metals. Group 1 (Li, Na, K...) are alkali metals. (1)

Q8 — (b) p-block. Elements whose last electron enters a p-orbital are p-block. (1)

Q9 — (c) K. K = Kalium = Potassium. (1)

Q10 — (c) generally brittle when solid. Non-metals are brittle, poor conductors, non-lustrous. (1)

Section B (6 marks)

Q11 (4 marks, 1 each): (i)→(B) Fe; (ii)→(A) Ca; (iii)→(D) Cu; (iv)→(C) He. Why: each Latin/standard symbol matched to its element.

Q12 (2 marks, ½ each rounded): (i)→(R) Noble gases; (ii)→(P) Alkali metals; (iii)→(Q) Halogens; (iv)→(S) Alkaline earth metals. (2)

Section C (6 × 2 = 12 marks)

Q13 — True (1). Reason: Mendeleev swapped positions (e.g. Co & Ni, Te & I) to keep elements with similar properties together, breaking strict mass order. (1)

Q14 — True (1). Reason: Metalloids (e.g. Si, Ge, As) have intermediate physical/chemical behaviour between metals and non-metals. (1)

Q15 — False (1). Reason: Nitrogen is N; Ni is the symbol for Nickel. (1)

Q16 — False (1). Reason: Elements in the same group have the same number of valence electrons; a period shares the same number of shells. (1)

Q17 — True (1). Reason: Ordering by atomic number placed anomalous pairs (Te/I, Co/Ni, Ar/K) correctly according to properties. (1)

Q18 — False (1). Reason: Hydrogen's position is disputed; it resembles both Group 1 and Group 17 and has no fixed placement. (1)

[
  {"claim":"Modern periodic table has 18 groups","code":"groups=18; result = (groups==18)"},
  {"claim":"Modern periodic table has 7 periods","code":"periods=7; result = (periods==7)"},
  {"claim":"Total marks add up to 30","code":"secA=10; secB=6; secC=6*2; result = (secA+secB+secC==30)"},
  {"claim":"Section A has 10 one-mark MCQs","code":"mcq=10; per_mark=1; result = (mcq*per_mark==10)"}
]