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The value of universal gravitational constant (G) in the SI unit is ______.
Concept: Newton's Universal Law of Gravitation
Give scientific reasons for the following:
Newton's gravitational law is the universal law of gravitation.
Concept: Newton's Universal Law of Gravitation
Calculate the escape velocity on the surface of the moon given the mass and radius of the moon to be 7.34 × 1022 kg and 1.74 × 106 m respectively.
(Given: G = 6.67 × 10-11 Nm2/kg2)
Concept: Free Fall
Observe the figure and answer the questions:
- State Newton's universal law of gravitation.
- If the distance between the two bodies is tripled, how will the gravitational force between them change?
- What will happen to gravitational force, if mass of one of the object is doubled?
Concept: Newton's Universal Law of Gravitation
Fill in the blank:
The modern periodic table consists of ……………. periods.
Concept: The Modern Periodic Table
Fill in the blank:
The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.
Concept: Periods and Electronic Configuration
The element eka-silicon in Mendeleev’s periodic table is known as ………… in the modern periodic table.
Concept: Mendeleev’s Periodic Table >> Insights into Mendeleev’s Periodic Table
Elements in the same group show the same valency. Give scientific reason.
Concept: Periods and Electronic Configuration
Write the electronic configuration of K and Ne.
Concept: Periods and Electronic Configuration
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
Concept: Periods and Electronic Configuration
Classify the following elements into metals, non-metals and metalliods
As, C, Hg, Mg, S, Si
Concept: Periods and Electronic Configuration
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Concept: The Modern Periodic Table
Differentiate between Normal elements and Transition elements.
Concept: Periods and Electronic Configuration
Write the name and symbol of the element from the description.
The atom having the smallest size.
Concept: Periodic Properties >> Atomic Size
Write the name and symbol of the element from the description.
The atom having the smallest atomic mass.
Concept: Periodic Properties >> Atomic Size
Write the name and symbol of the element from the description.
The most electronegative atom.
Concept: Gradation in Halogen Family
Write the name and symbol of the element from the description.
The noble gas with the smallest atomic radius.
Concept: Periodic Properties >> Atomic Size
Write a scientific reason.
Metallic character goes on decreasing while going from left to right in a period.
Concept: Metallic and Non-metallic Characters
