Science 9 Q2W1 Recall

Which shows the correct order in following atomic orbital?

• s,d,f,p

• s,p,d,f

• f,s,p,d

• f,p,d,s

Who formulated the "Uncertainty Principle"

• Erwin Schrodinger

• James Maxwell

• Isaac Newton

• Werner Heisenberg

What is the valence electron of Sulfur with electronic configuration of 1s² 2s² 2p⁶ 3s² 3p⁴ ?

• 3

• 6

• 8

• 2

What is the group and period of an element with electronic configuration of 1s² 2s² 2p⁶?

• Group VIA and period 2

• Group IVA and period 6

• Group IIA and period 6

• Group VIIIA and period 2

Answer explanation

Group = valence electron

Period = highest main energy level

 According to the quantum mechanical model, the orbitals of an atom have particular shape and direction in space. Which of the following orbitals takes the clover shape?

• s

• d

• p

• f

 All orbitals can hold a maximum of how many electrons.

• 2

• 1

• 4

• 3

What are the orbitals present in the third principal energy level?

• s,p

• s,p,d

• s,p,d,f

• s

Which quantum number describes the orbital shapes?

• Principal Quantum number

• Magnetic Quantum number

• Angular momentum quantum number

• Spin quantum number

According to the principle, electrons fill orbitals starting at the lowest available energy state before filling higher states (e.g., 1s before 2s).

• Aufbau Principle

• Uncertainty Principle

• Pauli’s Exclusion Principle

• Hund’s rule of Multiplicity

What is the valence electron of an element that has an electronic notation of 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁴ ?

• 2

• 5

• 6

• 8