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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Fill in the Blank an Excess of Electrons Produces a ...................... Charge. - Chemistry

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प्रश्न

Fill in the blank

An excess of electrons produces a ________ charge.

रिक्त स्थान भरें

उत्तर

An excess of electrons produces a negative charge.

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अध्याय 4: Atoms, Molecules and Radicals - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 4 Atoms, Molecules and Radicals
Additional questions | Q 23.5

संबंधित प्रश्न

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


The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?


Write the names of the elements present in the :- 

Sulphuric acid


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is such a particle called ?


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the charge on the particle ?


Fill in the blank

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


Fill in the blank

A deficiency of electrons produces a ________ charge.


What are the building blocks of matter ?


Fill in the following blanks with suitable words :

In water, the proportion of oxygen and hydrogen is .............. by mass.


Is it possible to see atoms these days ? Explain your answer.


Define the following term:

Atom


Deduce from the datum provided.

Datum To deduce
\[\ce{_11^23Na}\] Neutron number
\[\ce{_6^14C}\] Mass number
\[\ce{_17^37 Cl}\]  Proton number

Draw diagrams representing the atomic structures of the following:

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

The smaller particles found in the atom is called ______.


Define the following term with an example.

Metal


Define the following term with an example.

Metalloid


A change in the physical state can be brought about


A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?


Lead is also known as plumbum.


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