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?
What is the pH value of human blood?
Which of the following is NOT a radioactive element?
Gandhiji's first Satyagraha in India was held at __________
Which of the following increased in the 1920's?
Who invented the bifocal glasses?
In which year in India, was the demonetisation announcedfor the first time?