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प्रश्न
Differentiate between the following term:
Atomic number and mass number
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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
Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
The properties of the elements are a periodic function of their __________.
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. Mass number of an atom is the number of protons and | A: Electron |
| 2. The sub-atomic particle with a negligible mass. | B: Argon |
| 3. An atom having stable electronic configuration. | C: Nitrogen |
| 4. A molecule formed by sharing of electrons [covalency] | D: Sodium |
| 5. A metallic atom having unstable electronic configuration. | E: Neutrons |
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
What is a neutron?
The elementary particles such as protons and neutrons are collectively called ______.
An element has 2 electrons in its N shell.
What is its atomic number?
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
