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Question
State Dalton’s atomic theory.
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Solution
- Matter is made up of tiny particles called atoms
- Atoms are indivisible.
- Atom can be neither be created nor destroyed.
- Atoms of same element are identical in mass and properties
- Atoms of different elements differ in mass and properties
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ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Write the names of the elements present in the :-
Sulphuric acid
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Give two examples for each of ionic and covalent bond.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
What value has been given to the mass of this reference atom ?
Find the mass of 2 moles of nitrogen atoms.
Define the following term:
Atom
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
Define the following term with an example.
Element
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
Define the following term with an example.
Metal
Define the following term with an example.
Metalloid
1 mole of Gold and Silver contain same number of atoms.
A change in the physical state can be brought about
The most abundant type of atom is the universe is ______.
Lead is also known as plumbum.
