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دوری درجہ بندی

بارہویں جماعت · کیمیا · 5 سوالات

نام: ____________________   تاریخ: ____________

  1. Ionisation energy generally across a period from left to right:

    • A Decreases
    • B Increases
    • C Stays constant
    • D Becomes zero

  2. Which element has the highest electronegativity?

    • A Fluorine
    • B Oxygen
    • C Nitrogen
    • D Chlorine

  3. Atomic radius down a group:

    • A Decreases
    • B Is constant
    • C Doubles each time
    • D Increases

  4. Which of these has the largest radius?

    • A Na
    • B Cl
    • C Mg
    • D Al

  5. Electron affinity is the energy change when an atom:

    • A Gains a proton
    • B Gains an electron
    • C Gains a neutron
    • D Loses an electron

جوابی کلید

1. B, 2. A, 3. D, 4. A, 5. B

  1. Nuclear charge rises and atomic size falls, so electrons are held more tightly.

  2. Fluorine is the most electronegative element.

  3. More shells are added.

  4. Radius falls across period 3, so Na is the largest.

  5. It measures how readily an atom accepts an electron.