In a Periodic table the average atomic mass of Magnesium is given as 24.312 u .The average value is based on their relative natural abundance on earth. The isotopes and their masses are 2412Mg(23.98504 u),2512Mg(24.98584 u) and 2612Mg(25.9859 u) . The natural abundance of 2412Mg is 78.99% by mass. Calculate the abundance of two isotopes.

What type of questions asked from the lesson of magnetic effect of electric current 

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?