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प्रश्न
Fill in the blank
An excess of electrons produces a ________ charge.
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उत्तर
An excess of electrons produces a negative charge.
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संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
Write the names of the elements present in the following compound.
Common salt
Write the names of `"Ca"("NO"_3)_2` compounds :
Write the names of `"FeS"` compounds :
Fill in the blank:
Atoms are _____
Fill in the blank
An ion with positive charge is called ______
Name three non-metals/radicals which have valency -1, -2, and -3.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Fill in the blank
If an atom gains an electron, it is called an _______
Write the relation between nanometre and metre.
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
Define – Atom.
Define the following term with an example.
Non-metal
In all atoms of an element
In the nucleus of `""_20"Ca"^40`, there are ______
Give the salient features of “Modern atomic theory”.
