Advertisements
Advertisements
प्रश्न
What was Mendeleev's basis for the classification of elements?
Advertisements
उत्तर
Mendeleev's basis for periodic classification:
- Similarities in the chemical properties of elements.
- Increasing order of atomic weights of elements.
APPEARS IN
संबंधित प्रश्न
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down word equations of all the reactions taking place in this process.
Mention two uses of the following metals and non-metals
Gold
Give reasons
Magnesium is used in fire works.
Give reasons
Aluminium is used in making aircrafts.
Name a metal which is not malleable :
State the position of the following in the periodic table:
Aluminium
Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Write name of any element present in the same group as X
With reference to the following metals state their use in daily life metal:
iron
Higher Order Thinking Skills.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.
- Formulate a hypothesis based on the information provided.
- Briefly state how you would test the hypothesis.
Metals are ______ conductors of heat and electricity.
