Hi Aspirant!

Electrons exist in orbits and these orbits are known as levels. We number them as 1, 2, 3, and so on. In which the first level is closest to the nucleus and remaining levels become more and more distant with the increasing levels.

The levels can be broken down into sub-levels and we have s, p, d and f sub levels.

>> Level one has on sub level - 's'.

>> Level 2 has 2 sublevels - s and p.

>> Level 3 has 3 sublevels - s, p, and d.

>>Level 4 has 4 sublevels - s, p, d, and f.

=> Now, these sublevels contain orbitals and orbitals are the area in which electrons exist. The maximum electrons which an orbital can aquire is 2.

The  1 level has only s orbital, so it has only 2 electrons. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.

*** Now, coming to the 2n2 formula, according to which an atom's electron shell can accommodate 2n ² electrons (where n is the shell level). For example, the first shell can accommodate 2 x (1) X (1) or 2 electrons. The second shell can accommodate 2 x (2) X (2), or 8, electrons and third shell can have 2 X (3) X (3) , or 18 electrons.

So, basically both the systems : 2n2 formula and s,p, d, f are right. The 2n2 formula is not for sub-levels (s, p, d, f) , instead it is for a complete level (orbit).

You are mixing orbits (levels) with the sub- levels (s, p, d, f).

Hope you get it, thankyou!

Hello candidate,

Here is a List of some of the key important topics which were mainly focused in previous years EMCET question papers-

Bohr's radius and it's principles, schrodinger wave equation, Heisenberg Uncertainty principle, angular momentum, equation for radius and velocity of an electron, principal and azimuthal Quantum numbers, magnetic moment, spin quantum number.

Hope you found it helpful!!

Hello candidate,

The principal for filling up the orbitals is based on the n + l rule, and n refers to the principal quantum number, and l refers to the azimuthal quantum number.

The azimuthal quantum number for s, p, d, and f are zero, one, two, and three respectively. As per (n + l) rule in 6th period, order of orbitals filling is 6s, 4f, 5d, 6p.

Hope that this information about helpful for you.

Good luck!!

Hello Dear,

The concept originated in 1905 by Albert Einstein's explanation of the photoelectric effect Photon, also called light quantum In physics, a photon is a bundle of electromagnetic energy. It is the basic unit that makes up all light. The photon is sometimes referred to as a "quantum" of electromagnetic energy. Photons are not thought to be made up of smaller particles. They are a basic unit of nature called an elementary particle.

Good Luck

Hello Aspirant,

Henry Moseley developed his own law named Moseley's Law. This law established a relationship between atomic number of element and frequency of X-rays of that atom.

According to this law, the square root of frequency of X-rays imparted by elements is directly proportional to the atomic number of that element.

I hope this information helps you.

Good Luck!!

Hello!!!!

Hope you are doing great!!!!

The question is incomplete .Please make sure you complete the question,you can get to know the answer.You didnot  mention the element in which we have to find the radiation.And also make sure to mention the orbit level then it will be easy to answer,,

Hope it helps!!!

Hello Aspirant,

Matter waves are the waves that are associated with a moving quantum particle. These waves interfere like ordinary waves in space, and the regions where these waves interfere constructively are the most probable regions for the presence of the associated particle.

In phase means that the phase angle of two waves are the same or are in arithematic progression with the common difference.

Hope it helps.

Good Luck!

Hello Aspirant,

Postulates of Bohr's atomic model are described below :-

• Electrons revolve in definite circular around nucleus.
• As long as they revolve, they neither lose nor gain energy. Such orbits are called stationary orbits.
• When an electron jumps from an orbit of higher energy to lower energy it release energy in the form of radiations and vice-versa.
• An angular momentum of revolving electron is an integral multiple of h/2π.

It was propsed by Bohr to explain the stability of atom and the line spectrum of hydrogen atom.

I hope this answer helps you.

For further doubts feel free to ask here.

Good Luck!!

Hello dear student,

As you have asked for the highest atomic weight that means the heaviest atom which is present in periodic table. So ununoctium is the heaviest atom which is present and this element is man made. while the naturally occurring element with the highest atomic weight is uranium. Atomic weight 238.0298

I hope this was helpful

Thank you

Hi Vijay,

Mass number = Number of protons + Number of neutrons

Atomic number = number of protons or number of electrons

Atomic number of zinc = 30 i.e., has 30 electrons.  In dipositive ion 2 electrons are lost, so, 28 electrons are present.

Mass number = 70

70 = 30 + Number of neutrons

Thus number of neutrons in dipositive zinc ion with mass number 70 is 40.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!