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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Write the Names of Na_3po_4 Compounds :

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प्रश्न

Write the names of `"Na"_3"PO"_4` compounds :

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उत्तर

`"Na"_3"PO"_4`    -   Sodium  Phosphate 

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अध्याय 4: Atomic Structure - Exercise

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एस पी सिंग Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atomic Structure
Exercise | Q 8.4

संबंधित प्रश्न

Why is it not possible to see an atom with naked eyes?


Tick the most appropriate answer.

Who discovered that radioactive rays are given out by uranium?

  1. Henri Becquerel
  2. Marie Curie
  3. Pierre Curie
  4. Schmidt

TRUE \ FALSE

Neils Bohr gave the theory to explain the arrangement of protons in an atom.


Define:- Atom


Write the names of `"Ca"("NO"_3)_2` compounds :


Fill in the blank

An ion with positive charge is called ______


Name two particles found inside the nucleus. What are they collectively called ?


Who originated the word ‘atom’ ?


An atom has 13 protons and 14 neutrons.

How many electrons would be present in this atom ?


Fill in the blank

If an atom loses an electron, it acquires ______ a charge.


Name the three subatomic particles present in an atom.


Give scientific reason.

All the mass of an atom is concentrated in the nucleus.


Draw diagrams representing the atomic structures of the following:

  1. Sodium atom
  2. Chlorine ion
  3. Carbon atom
  4. Oxygen ion

State true or false. If false, correct the statement.

The basic unit of an element is molecule.


Assertion: An atom is electrically neutral.

Reason: Atoms have equal number of protons and electrons.


Define the following term with an example.

Metalloid


Which of the following statements made by Dalton has not undergone any change?


Does the solubility of a substance change with temperature? Explain with the help of an example.


The graphite refill used is pencil is made of element called ______.


The first scientific theory about atoms was given by J J. Thomson.


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