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Question
Name three non-metals/radicals which have valency -1, -2, and -3.
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Solution
-1 = Chlorine, Bromine, Iodine.
-2 = Oxide, Sulphide, Sulphate.
-3 = Nitrogen, Nitride Phosphate.
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ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define:- Atom
Define:- Radicals
An atom has 13 protons and 14 neutrons.
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A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
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If an atom gains an electron, it is called an _______
How is the size of an atom indicated ?
Name the unit in which the radius of an atom is usually expressed.
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?
Draw the electron dot structure of this compound.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
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Which of the following statements made by Dalton has not undergone any change?
Atoms of one element can be transmuted into atoms of other elements by ______
Which of the following has maximum number of atoms?
The smallest unit of an element is ______.
