11. Sınıf Kimya Pop-quiz-2 (Q. Sayıları-Elektron Dağılımı)

What is the maximum number of electrons with quantum numbers of n= 3, l= 2 and m_l= 0?

• 1

• 2

• 3

• 4

• 5

Which of the following sets of quantum numbers is permissible for an electron?

• n=1 l=0 ml =0 ms= +1

• n=1 l=3 ml =+3 ms= +1/2

• n=3 l=2 ml =-2 ms= -1/2

• n=2 l=3 ml =0 ms= +1

• n=0 l=1 ml =0 ms= +1/2

Which of the following particles has no electrons in 4s orbitals?

I. ₂₉Cu⁺²

II. ₂₆Fe⁺³

III. ₃₅Cl⁺⁵

• Only I

• Only II

• Only III

• I and II

• II and III

The electron configuration of X element ends with 3d³ and it has 26 neutrons.

a) What is the mass number of the element?

b) Write it’s electron configuration.

c) How many unpaired electrons are there?

d) Write electron configuration of X⁺³ ion.

Which of the following is not correct for Boron, ₅B?

• The ground state electron configuration is 1s² 2s² 2p^1.

• The shorthand electron configuration is [He] 2s² 2p¹.

• The excited state electron configuration may be 1s² 2s² 3s¹.

• It has spherically symmetric electron configuration.

• It’s the third element in period 2.