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Which of the following choices become saturated by the higher number of electrons?

• One of 4f orbitals

• 3d sublevel

• Principal level n=2

• One of 3d orbitals

The two electrons of helium atom are not similar in the -----

• Principal quantum number

• Magnetic quantum number

• Subsidiary quantum number

• Spin quantum number

The two orbitals (2s, 3p_x) can be similar in -----

• The energy

• The shape

• The number of electrons in each of them

• The spatial orientation

The electrons of 5d sublevel in one of the atoms cannot have the magnetic quantum number -----

• +1

• +2

• +3

• -1

In which of the following sublevels the 2 quantum numbers of the last electron are n=2, l=0

• 2s

• 2p

• 1s

• 3p

Which of the following elements has the smallest radius?

• Mg12

• Al13

• Si14

• K19

Who first introduced the uncertainty principle?

• De Broglie

• Dirac

• Schrödinger

• Heisenberg

Who established the quantum mechanical model of the atom?

• Bohr

• Dalton

• Schrödinger

• Heisenberg

Which element has 3 valence electrons?

• A

• B

• E

• C

What is the name of Groups 18?

• Alkali Metals
• Alkali Earth Metals
• Halogens
• Noble Gases