Chemistry MCQs
Practice free Chemistry multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 1238 questions — no login required.
Question 280hard
The mass number of a nucleus is
Question 281medium
Atomic number is the number equal to
Question 282hard
Rutherford’s scattering experiment proved the presence of
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Question 283easy
Number of neutrons in an atom of hydrogen is
Question 284hard
The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?
Question 285hard
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is
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Question 286easy
Atoms of same element having different mass numbers are called________
Question 287medium
How many neutrons does iron have?
Question 288hard
The electronic configuration of an atom having atomic number ‘20’ is