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प्रश्न
Name three non-metals/radicals which have valency -1, -2, and -3.
उत्तर
-1 = Chlorine, Bromine, Iodine.
-2 = Oxide, Sulphide, Sulphate.
-3 = Nitrogen, Nitride Phosphate.
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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.
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Acetic acid
Fill in the blank
An ion with negative charge is called _______
Define: Chemical bond
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X ?
Fill in the blank
If an atom gains an electron, it is called an _______
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
One nm is equal to :
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Name the gas that.
Turns moist starch iodide paper blue black.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Define – Atom.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Define the following term with an example.
Compound
Define the term ions or radicals.
Which of the following has maximum number of atoms?
Does the solubility of a substance change with temperature? Explain with the help of an example.
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
