Chemistry
Two atoms are said to be isobars if they have the same:
- number of neutrons but different number of electrons.
- number of electrons but different number of neutrons.
- atomic number but different mass numbers.
- sum of protons and neutrons but the number of protons is different.
Atomic Structure
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Answer
Sum of protons and neutrons but the number of protons is different.
Reason - Isobars are atoms of different elements that have the same mass number (A) but different atomic numbers (Z).
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Related Questions
Which of the following statements is not correct about the characteristics of cathode rays ?
- They start from cathode and move towards anode.
- They do not depend upon the material of the electrode.
- Their characteristics depend upon the nature of the gas present in the cathode ray tube.
- They travel in straight lines in the absence of an external electrical or magnetic fields.
Which statement is incorrect about electrons ?
- Electron is a negatively charged particle.
- Its mass is equal to the mass of neutron.
- It is a constituent of cathode rays.
- It is a basic constituent of all atoms.
An atom is neutral, its nucleus contains:
P — Negatively charged particles.
Q — Neutral particles.
R — Positively charged particles.
- Only P
- Only Q
- Only R
- Both Q and R
Postulates of modern atomic theory are:
P — Atoms of an elements may not be alike.
Q — Atoms of elements combine in small whole numbers to form molecules.
R — Atoms can neither be created nor destroyed.
- Only P
- Only Q
- Only R
- Both P and Q