Answer:
Bohr used emission spectrum for its mono atomic model....
Explanation:
Emission Spectrum is produced when atoms are excited by energy. After excitation, they emit this energy in the form of different wavelengths according to the type of atom and produce a unique fingerprint of themselves called as it's emission spectrum.
Absorption Spectrum is a type of spectrum that is produces when photons of light are absorbed by electrons at one state. they jump to another state and may cause scattering. This produces a specific absorption spectrum for that specific atom.
A) 21
Explanation:
The difference between the number of electrons in an atom of selenium and the number electrons in an atom of Aluminium is 21;
The number of electrons in Aluminium is 13
Selenium is 34
Since the atoms are considered here, their atomic number, number of protons and number of electrons are the same.
It is only when we are considering ions that the number of electrons differ from the atomic number/ number of protons.
Difference = 34 - 13 = 21
We clearly see that selenium is 13 electrons more than aluminium.
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1 cm ------------ 10 mm
5,678 cm ------- ?
5,678 x 10 / 1 => 56,78 mm
Balancing of chemical equation is essential because of the law of conservation of mass, which states that the mass of a system can not be created or removed.
The second equation is balanced
This is because the number of elements of each atom in the product side equal the number of elements of each atom on the reactant side.
The first equation is not balanced
This is because there is 1 molecule of on reactant side as compared to 3 molecules of
To balance the equation we add a coefficient of 3 on sulphuric acid () and a coefficient of 3 on hydrogen ()