Select the correct Statements from the following :
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is $$9.10939 \times 10^{-31} \mathrm{~kg}$$.
C. All the isotopes of a given elements show same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.
Choose the correct answer from the options given below.
The relation between $$\mathrm{n}_{\mathrm{m}},\left(\mathrm{n}_{\mathrm{m}}=\right.$$ the number of permissible values of magnetic quantum number $$(\mathrm{m})$$) for a given value of azimuthal quantum number $$(l)$$, is
Match List-I with List-II :
| List-I (quantum number) |
List-II (orbital) |
||
|---|---|---|---|
| (a) | n = 2, l = 1 | (i) | 2s |
| (b) | n = 3, l = 2 | (ii) | 3s |
| (c) | n = 3, l = 0 | (iii) | 2p |
| (d) | n = 2, l = 0 | (iv) | 3d |
Choose the correct answer from the options given below :
When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 $$\times$$ 105 J mol$$-$$1. What is the minimum energy needed to remove an electron from the metal?
(h = 6.626 $$\times$$ 10$$-$$34 Js, c = 3 $$\times$$ 108 ms$$-$$1, NA = 6.022 $$\times$$ 1023 mol$$-$$1)