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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

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

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प्रश्न

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]

संख्यात्मक
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उत्तर

Structure of atoms:

Z is Atomic Number and A is the mass number
Carbon \[\ce{^12_6C}\]
Z = 6 = p = e
              K L
e = 6 = 2, 4
A = p + n
12 = 6 + n
∴ n = 12 − 6 = 6

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अध्याय 4: Atomic Structure - Objective type questions

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विराफ जे दलाल Simplified Middle School Chemistry [English] Class 8 ICSE
अध्याय 4 Atomic Structure
Objective type questions | Q 5.2

संबंधित प्रश्न

Complete the following table.

Atomic number Mass number Number of Neutrons Number of protons Number of electrons Name of the Atomic species
9 - 10 - - -
16 32 - - - Sulphur
- 24 - 12 - -
- 2 - 1 - -
- 1 0 1 0 -

Tick the most appropriate answer.

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  1. isobars
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  3. isotopes
  4. none of these

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(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.

(b) What is the relation between the atomic number and mass number of an element?

(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?


The atom of an element X has 7 electrons in its M shell.
What is the atomic number of element X?


Atomic number : ______ :: Mass number : Number of protons and neutrons.


What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.


Complete the following table.

Atomic Number Mass Number Number of Neutrons Number of Protons Number of Electrons Name of the Element
9 ______ 10 ______ ______ ______
16 ______ 16 ______ ______ ______
______ 24  ______ ______ 12 Magnesium
______ 2 ______ 1 ______  ______
______ 1 0 1 1 ______

A ______ number describes a specific aspect of an electron.


Ca2+ has completely filled outer shell. Justify your answer.


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