1. MCQs (With Correct Answers Marked)
  1. Which of the following group contains alkali metals?
    a. IA*
    b. IIA
    c. IIIA
    d. IVB
  2. Which of the following elements is not an alkali metal?
    a. Li
    b. Na
    c. K
    d. Mg*
  3. An element has three electrons in its outermost shell. In which group of the Periodic Table is it likely to be found?
    a. Group IA
    b. Group IIA
    c. Group IIIA*
    d. Group 0
  4. Which of the following elements is a metalloid?
    a. Gold
    b. Sulphur
    c. Iron
    d. Silicon*
  5. Lithium is in the same group as:
    a. Magnesium
    b. Sodium*
    c. Calcium
    d. Carbon
  6. Which of the following is a halogen?
    a. Magnesium
    b. Sodium
    c. Helium
    d. Fluorine*
  7. How many elements are present in the first period?
    a. 2*
    b. 8
    c. 18
    d. 32
  8. How many electrons are present in the outermost shell in Group IIIA elements?
    a. 1
    b. 2
    c. 3*
    d. 8
  9. Which of the following group contains noble gases?
    a. IA
    b. IIA
    c. VIIA
    d. 0*
  10. Period number of neon (atomic number 10) is:
    a. 1
    b. 2*
    c. 3
    d. 4

 

  1. Short Questions
  2. Write common names for group of normal elements.

Alkali metals, alkaline earth metals, halogens, noble gases.

  1. Suggest why copper and aluminum are used in electricity cables.

Copper and aluminum are used in electricity cables because They are good conductors of electricity, lightweight, and durable.

iii. Many pots and pans are made of steel instead of pure iron. Why?

Steel is stronger, more durable, and resistant to rust compared to pure iron.

  1. Write three properties that make gold suitable for making jewelry.

Gold is malleable, ductile, and resistant to corrosion or tarnishing.

  1. In which portion of the periodic table are present:
  2. Metals: Left and center of the periodic table.
  3. Non-metals: Upper right of the periodic table.
  4. Metal wires can be transformed into different shapes without breaking. Why?

Because they are ductile.

vii. Why are electrical cables covered with plastic?

Plastics are good insulators, preventing electrical shocks and short circuits.

 

  1. Long Questions
  2. How can you locate an element in the periodic table?

To locate an element in the periodic table, you need to know its atomic number. The atomic number determines the element’s position:

  • Group: Elements in the same group have the same number of valence electrons and similar chemical properties.
  • Period: The period indicates the number of electron shells in the atom.

Locations of Given Elements:

  • Aluminum (Atomic no. 13): Found in Group IIIA (13) and Period 3.
  • Silicon (Atomic no. 14): Found in Group IVA (14) and Period 3.
  • Fluorine (Atomic no. 9): Found in Group VIIA (17) and Period 2.

 

  1. Justify that the properties of metals make them suitable for making many objects or parts.

Metals possess unique properties that make them ideal for various applications. Here are three examples:

  1. Conductivity:
    Metals like copper and aluminum are excellent conductors of electricity. This is why they are widely used in electrical wires and cables.
  2. Strength:
    Steel, an alloy of iron, is incredibly strong and durable, making it suitable for constructing buildings, bridges, and machinery.
  3. Malleability:
    Metals like aluminum are malleable, meaning they can be flattened into thin sheets or shaped without breaking. This property is why aluminum is used for making cans, foils, and aircraft parts.

 

  1. Structured Questions
  2. Interpretation of the periodic table diagram (Figure A to F):
    • Group A: Alkali metals.
    • Group B: Alkaline earth metals.
    • Group C: Transition metals.
    • Group D: Metalloids and non-metals.
    • Group E: Halogens.
    • Group F: Noble gases.

 

  1. a) Which elements are present in the same group?

Elements in the same group include those that share similar chemical properties and have the same number of valence electrons. For example:

  • Lithium (Li), Sodium (Na), and Potassium (K) are in Group IA.
  1. b) Which elements are present in the same period?

Elements in the same period share the same number of electron shells. For example:

  • Sodium (Na), Magnesium (Mg), and Aluminum (Al) are in Period 3.
  1. c) What is the group number of C?

Carbon (C) is in Group IVA (Group 14).

  1. d) Which elements have the same number of electrons in their outermost shell?

Elements in the same group have the same number of valence electrons. For example:

  • Fluorine (F) and Chlorine (Cl) have 7 electrons in their outermost shell.
  1. e) Which element is a noble gas?
  • Neon (Ne) is a noble gas.
  1. f) Which element is an alkaline earth metal?
  • Magnesium (Mg) is an alkaline earth metal.
  1. g) In which group element E is present?

The group of element E is not explicitly mentioned in the question. Assuming element E corresponds to a group, its placement would depend on additional context.

  1. h) Which element has two electrons in its outermost shell?
  • Magnesium (Mg) has 2 electrons in its outermost shell.

 

  1. Element carbon (At. No. 6) is present in Group IVA in the periodic table.
  2. a) Why is carbon placed in Group IVA in the periodic table?

Carbon is placed in Group IVA because it has 4 valence electrons in its outermost shell.

  1. b) How many electrons does carbon need to complete its valence shell?

Carbon needs 4 electrons to complete its valence shell (to reach 8 electrons).

  1. c) How many single bonds can carbon make?

Carbon can form 4 single covalent bonds due to its 4 valence electrons.

 

  1. Draw electronic structures of:
  2. a) Oxygen (At. No. 8):
    Oxygen has 8 electrons, distributed as 2 in the first shell and 6 in the second shell.
  3. b) Fluorine (At. No. 9):
    Fluorine has 9 electrons, distributed as 2 in the first shell and 7 in the second shell.
  4. c) Neon (At. No. 10):
    Neon has 10 electrons, distributed as 2 in the first shell and 8 in the second shell.

 

Write the difference in the electronic structure of these elements.

  • Oxygen: Has 6 valence electrons, making it reactive and capable of forming bonds.
  • Fluorine: Has 7 valence electrons, making it highly reactive.
  • Neon: Has a full outer shell (8 electrons), making it stable and inert.