Chemistry Quiz

According to the Aufbau Principle, which orbital is filled first?

• 2p

• 1s

• 3d

• 4s

Which of the following elements has a completely filled 4d subshell?

• Zirconium (Zr)

• Silver (Ag)

• Cadmium (Cd)

• Rhodium (Rh)

How does the effective nuclear charge (Zeff) change across a period from left to right in the periodic table?

• It decreases

• It increases

• It stays constant

• It fluctuates

What is the trend in electronegativity as you move from left to right across a period in the periodic table?

• Electronegativity decreases

• Electronegativity increases

• Electronegativity remains constant

• Electronegativity first increases and then decreases

Which of the following electron configurations corresponds to a ground-state configuration of an atom in period 4?

• [Ar] 4s² 3d¹⁰ 4p³

• [Ar] 4s² 3d⁸ 4p⁶

• [Ar] 4s² 3d⁶

• [Kr] 5s² 4d¹⁰

Which of the following particles is responsible for the chemical behavior of an atom?

• Neutron

• Proton

• Electron

• Neutron and Proton

What is the number of valence electrons in a carbon atom?

• 4

• 6

• 2

• 8

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Zero

Which element is represented by the symbol "Na"?

• Neon

• Nitrogen

• Sodium

• Sulfur

Which element has the following electron configuration: 1s² 2s² 2p⁶ 3s²?

• Phosphorus

• Calcium

• Magnesium

• Neon