SCIENCE-9

According to the Bohr model, how many electrons can the first orbital hold?

• 2

• 4

• 6

• 8

2. Which of the following can happens to the energy of an electron when it jumps from an outer to an inner orbit?

• It is absorbed

• It remains constant

• It is emitted / released

• It could either increase or decreases

What is the name of the model of the atom that scientists use today?

• Billiard Model

• The Nuclear Model

• Plum Pudding Model

• Quantum Mechanical Model

Who described the electrons as waves that move in orbitals?

• Chadwick

• Rutherford

• Schrodinger

• Thomsom

Who proposed the probability that electrons will be found in certain regions around the nucleus of an atom?

• Niels Bohr

• Ernest Rutherford

• Erwin Schrodinger

• Joseph John Thomsom

Who states that “it is impossible to determine both the momentum and the position of an electron at the same time accurately?

• Hund's Rule

• Aufbau Principle

• Uncertainty Principle

• Pauli's Exclusion Principle

Which occurs when an electron moves from high energy level to a low energy level?

• The atoms move faster

• Colored light is given off.

• Colored light is given off

• Another electron goes from a low energy level to a high- energy level

How many orbitals are present in the third principal energy level?

• 2

• 3

• 6

• 9

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

• Group II period 3

• Group 4 period 2

• Group 8 period 2

• Group 8 period 4

Which is the correct valence electron of element found in group 2 of the Periodic Table?

• 3p¹

• 4s²

• 3p⁵

• 3s². 5p⁶