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प्रश्न
Give two examples for each of ionic and covalent bond.
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उत्तर
Example of ionic bonds— Sodium chloride and calcium oxide.
Example of covalent bond— Water, carbon dioxide.
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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
What is radioactivity?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define: Ions
Name the particles which revolve around the nucleus.
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Name three non-metals/radicals which have valency -1, -2, and -3.
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
What is an atom ? How do atoms usually exist ?
One nm is equal to :
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.
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
State true or false. If false, correct the statement.
An atom is electrically neutral.
Define – Atom.
______ is the smallest particle of an element.
Define the term ions or radicals.
Give the salient features of “Modern atomic theory”.
