35. In an atom, two electrons are have common quantum number n 4, l 2. How many

Question

35. In an atom, two electrons are have common quantum number n 4, l 2. How many states are possible for the atom? c) 45 d) 90 b) 10 a) 5 36. The electron in higher-n orbit has a) larger orbit radius b) lower energy d) lower speed. c) lower potential energy 37. Consider the hydrogen atom, singly ionized helium atom, and the doubly ionized lithium atom. Arrange these atoms from lowest energy ground state to highest energy ground state. b) Li He ,H c) H,Li**, He a) H, He*, Li** d) Since each of these atoms has only one electron, they all have the same energy groun state.

Explanation / Answer

35. the atomic states will be sum of two electron states l=2

number of states are 2*(2l+1) =10

Correct answer b

36. the radius of orbit is n2 * 5.30*10-11 m

so, orbit radius will increase with n values

Correct answer a

37. energy level E = -13.6 *Z2/n2 eV

for ground state n=1 and for H, He and Li, Z = 1, 2, 3 . so, the ground energy for hydroegn will be highest.

Correct answer b

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