Teaching CTET (Paper 1 & Paper 2) Mock Test Series 2025 General Science Chemistry Basic Concepts of Chemistry
Statement 1: The atomic number of an element is equal to the number of protons in the nucleus.
Statement 2: The mass number is the sum of the protons and electrons in an atom.
Statement 3: Isotopes of an element have the same atomic number but different mass numbers.
Which of the following options is correct?
1
Statement 1 and 3 are correct, Statement 2 is incorrect.
2
Statement 1 and 3 are correct, Statement 2 is incorrect
3
All three statements are correct.
4
Statement 1 and 2 are correct, Statement 3 is incorrect.