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प्रश्न
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
उत्तर
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define:- Radicals
Write the names of `"Na"_3"PO"_4` compounds :
Define: Relative atomic mass
Give the charge and the mass of an electron, proton and neutron present in an atom ?
What are orbits or shells ?
Give two examples for each of ionic and covalent bond.
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The nucleus of an atom
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 loses an electron, it acquires ______ a charge.
Fill in the blank
A deficiency of electrons produces a ________ charge.
Write the relation between nanometre and metre.
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
What is an atom ? How do atoms usually exist ?
One nm is equal to :
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Define the following term with an example.
Element
Define – Atom.
An element is composed of ______ atoms.
The smallest unit of an element is ______.
______ is a substance that is made up of three oxygen atoms chemically combined.
Lead is also known as plumbum.
What is the fundamental particle of an element?
