EVERYDAY SCIENCE

Detailed explanation-1: -The isotopes have same atomic number and different mass number. Thus they have same number of protons and electrons and different number of neutrons and nucleons. Thus correct answer is option C as statement of option C is false.

Detailed explanation-2: -Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2). Isotopes of a given element contain different numbers of neutrons, therefore, different isotopes have different mass numbers.

Detailed explanation-3: -Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element’s atomic number on the Periodic Table.

Detailed explanation-4: -Explanation: Statement 1 is incorrect: Isotopes are those elements having the same atomic number and different mass number. In isotopes the atoms have different numbers of neutrons but the number of protons remains the same.

Detailed explanation-5: -The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons.