Chemistry
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
- mass number
- atomic number
- valency
- none of these
Atomic Structure
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Answer
mass number
Reason — The sum of number of protons and number of neutrons present in the nucleus of an atom is called the mass number of that element.
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Related Questions
If the atomic number of an atom is 17 and mass number is 35, then number of neutrons will be
- 35
- 17
- 18
- 52
The number of electrons in an atom is equal to the number of
- protons in a neutral atom
- neutrons in a neutral atom
- nucleons in a neutral atom
- none of the above
The correct electronic configuration of sodium is:
- 2, 8, 1
- 1, 2, 8
- 8, 2, 1
- 8, 1, 2
Assertion (A): Matter consists of very small particles called atoms.
Reason (R): Atoms are indivisible.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.