The electronic configuration of an element is 2, 8, 4. State its:
  1. Group and period in the modern periodic table.
  2. Name and write its one physical property.
CBSE 31-1-3 PAPER SET 2019
Download our app for free and get startedPlay store
  1. Group - 14, Period - 3.
  2. Silicon.
Non - metallic/ poor conductor of electricity.
art

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*

Similar Questions

  • 1
    Draw ray diagrams each showing:
    Myopic eye.
    View Solution
  • 2
    Why does the Sun appear reddish early in the morning?
    View Solution
  • 3
    Write the function of the retina in the human eye.
    View Solution
  • 4
    Why are the ‘danger signal’ lights red in colour?
    View Solution
  • 5
    Which is refracted most by a prism: red light or violet light? Explain why?
    View Solution
  • 6
    Why is a normal eye not able to see clearly the objects placed closer than 25cm?
    View Solution
  • 7
    A person needs a lens of power, -5.5 dioptres for correcting his distant vision. For correcting his near vision, he needs a lens of power, +1.5 dioptres. What is the focal length of the lens required for correcting
    1. Distant vision, and
    2. Near vision?
    View Solution
  • 8
    Why do stars twinkle?
    View Solution
  • 9
    Explain with the help of a diagram, how we are able to observe the sunrise about two minutes before the sun gets above the horizon.
    View Solution
  • 10
    Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.
    View Solution