Question

Explain how Mendeleev's contribution laid the foundation of Modern Penodic Table
Explain the change in Gravitational Acceleration due to change along the surface of the earth​

Answer 1

Answer:

1.Explain how Mendeleev's contribution laid the foundation of Modern Penodic Table

ans: Mendeleev laid the foundation for the Modern Periodic Table by classifying 63 elements in increasing order of their atomic masses. He arranged them in 8 groups by leaving gaps for undiscovered elements and predicting their properties. He made separate groups for metals and non-metals.

2.Explain the change in Gravitational Acceleration due to change along the surface of the earth

ans: The acceleration of an object changes with altitude. ... As the distance is tripled, the gravitational acceleration decreases by a factor of 9, and so on. At the surface of the Earth, the acceleration due to gravity is roughly 9.8 m/s2 (32 ft/s2). The average distance to the centre of the Earth is 6,371 km .