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प्रश्न
Differentiate between the following term:
Atomic number and mass number
उत्तर
Differentiate between:
Atomic number:
- Z is the number of protons or the number of electrons in an atom.
- Present in nucleus = P
Present in orbits = e
Mass number:
- A is the sum of protons and neutrons.
- Present in the nucleus of an atom.
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संबंधित प्रश्न
Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na+, K+, Mg2+, Ca2+, S2–, Ar
Write true or false for the following statement
An atom on the whole has a positive charge.
Multiple Choice Questions
The sub atomic particle with negative charge is
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
Sulphur has an atomic number 16 and a mass of 32.
State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.
State the main postulates of Dalton’s atomic theory.
If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Carbon – \[\ce{^12_6C}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
What is the relation between mass number & atomic number?
