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Principle Quantum number describes?
The principal quantum number (n) describes the size of the orbital.
Example: Orbitals for which n = 2 are larger than those for which n = 1.
In detail Explanation: The principal quantum number is one of four quantum numbers assigned to each electron in an atom to describe that electron's state. Its values are natural numbers (from 1) making it a discrete variable. It is used to describe the size of the orbital.
The atoms of different isotopes of the same element differ from each other in the number of:
For example: , where 6 which is common among all is atomic number of the element and atomic number is proton number so number of protons is equal and is 6 whereas 12,13 and 14 are mass number which are different and is sum of protons and neutrons. That results in a different neutron number as the proton number is the same.
So, considering the Isotope of C, which has 6 electrons because the atomic number is 6.
So, the atoms of various isotopes of a particular element differ from each other in the number of neutrons in the nucleus.
Therefore, the correct answer is option (B).
The radius of the nucleus of an atom is approximately:
It is found that the radius of the nucleus is approximately 10-15 m.
An element has 18 electrons, and 20. neutrons. Its charge is -2. What is its mass number?
The mass number of an element is the sum of the number of protons and neutrons in the nucleus of an atom. The number of protons in the nucleus of an atom is equal to the atomic number of the element, which determines the element's identity. The atomic number is also equal to the number of electrons in a neutral atom.
In this case, the element has 18 electrons and a charge of -2, which means it has 2 more electrons than protons. The atomic number of the element is therefore 18 - 2 = 16.
The number of neutrons in the nucleus is 20, and the number of protons is 16. Therefore, the mass number of the element is 20 + 16 = 36.
Which of the following statements is not correct about the characteristics of cathode rays?
The correct answer is Option 4: Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube. Cathode rays do not depend on the material of electrode and nature of the gas that is filled in the discharged tube. However, the e/m ratio of the charge to mass of the particle is different in the case of anode rays and is dependent on the material of the electrode and the gas present in the discharged tube.
Which model describes that there is no change in the energy of electrons as long as they keep revolving in the same energy level and atoms remains stable?
Bohr Model of atom:
Bohr explained the stability through the concept of revolution of electrons in different energy levels.
The change in the energy of an electron occurs when it jumps from lower to higher energy levels. When it gains energy, it excites from lower to higher and vice versa.
Thus energy is not lost and the atom remains stable.
The number of radial nodes for 3p orbital is:
where n = principal quantum number, l = azimuthal quantum number
Atomic mass of an element is equal to the sum of?
Hence the correct answer is C.
Thomson’s plum pudding model explained:
Which of the following conclusions could not be derived from Rutherford’s α -particle scattering experiment?
The charge on electron was determined by:
The charge on electrons was determined by Milliken by using an oil drop experiment.
The nature of positive rays depends on?
The nucleus of a tritium atom, 3H, contains
Which of the following is true about electron?
Therefore, the correct answer is A.
Neutron is a fundamental particle which carries?
Hence the correct answer is A.