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प्रश्न
Which of the following statement is correct about the atom of an element ?
विकल्प
an atom can have only protons and neutrons but no electrons.
an atom can have only electrons and neutrons but no protons
an atom can have only electron and proton but no neutron
an atom must always have a proton, neutron and electron
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उत्तर
an atom can have only electron and proton but no neutron
An atom must have a proton and an electron, but it may not have a neutron.
For example, in hydrogen atom, there is 1 proton, 1 electron but no neutron.
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संबंधित प्रश्न
ANSWER IN DETAIL
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Fill in the blank
An ion with negative charge is called _______
Name two particles found inside the nucleus. What are they collectively called ?
Name three non-metals/radicals which have valency -1, -2, and -3.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
Fill in the blank
A deficiency of electrons produces a ________ charge.
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Find the mass of 2 moles of nitrogen atoms.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Define the following term with an example.
Element
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Define – Atom.
Define the following term with an example.
Compound
Define the following term with an example.
Non-metal
The number of atoms present in a molecule is called its ______.
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
Write any two observations which support the fact that atoms are divisible.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
