There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?
View Answer Report Error Discuss
How many groups and periods are present in the Modern Periodic Table?
Who invented the bifocal glasses?
(−12)[11+7×(−3)]÷{}[413−(−3)×(−6)]=
To cover a certain distance with a speed of 60 km/hr, a train takes 15 hours. If it covers the same distance in 12 hours, what will be its speed?
In which year in India, was the demonetisation announcedfor the first time?
Gandhiji's first Satyagraha in India was held at __________
Which of the following increased in the 1920's?