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प्रश्न
Define the following term with an example.
Element
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उत्तर
Element: It is a substance that cannot be broken down into simpler substance by chemical means
Ex.: Oxygen, Hydrogen, Gold & Helium.
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संबंधित प्रश्न
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 SHORT ANSWER
Name three inert gases.
Write the names of the elements present in the:-
Acetic acid
Write the names of `"FeS"` compounds :
Define: Chemical bond
Define: Covalent bond
Who originated the word ‘atom’ ?
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
Define: An Atom:
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
An excess of electrons produces a ________ charge.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
What is an atom ? How do atoms usually exist ?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
A compound containing one atom of carbon and two atoms of oxygen is ______.
K: Potassium:: C: ______.
Define the term ions or radicals.
Atoms of different elements having the same number of ______ are called isotones.
A change in the physical state can be brought about
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
