Exploring the Periodic Table

What is the main organising principle of the Periodic Table?

• Increasing electron affinity

• Decreasing atomic mass

• Increasing atomic number

• Random arrangement of elements

How is the atomic number of an element defined?

• The atomic number is the total number of electrons in an atom.

• The atomic number is the number of protons in an atom's nucleus.

• The atomic number is the number of isotopes an element has.

• The atomic number is the sum of neutrons and protons in an atom's nucleus.

What does the atomic mass of an element represent?

• The atomic mass is the mass of a single isotope only.

• The atomic mass indicates the number of electrons in an element.

• The atomic mass is the total number of protons in an atom.

• The atomic mass represents the weighted average mass of an element's isotopes.

Which subatomic particle determines the atomic number?

• Photon

• Proton

• Neutron

• Electron

How are elements arranged in the Periodic Table?

• Elements are grouped solely by their color.

• Elements are arranged by increasing atomic number and grouped by similar properties.

• Elements are arranged by decreasing atomic mass.

• Elements are arranged randomly without any specific order.

What is the electron configuration of oxygen?

• 1s² 2s² 2p²

• 1s² 2s² 2p⁵

• 1s² 2s² 2p⁴

• 1s² 2s² 2p³

What is the significance of groups in the Periodic Table?

• Groups represent the atomic number of elements.

• Groups indicate elements with similar chemical properties and reactivity.

• Groups indicate the number of protons in an atom.

• Groups are used to categorize elements by their physical state.

How many electrons can the first shell of an atom hold?

• 2

• 10

• 8

• 1

What is the electron configuration for sodium?

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s¹ 2p⁶ 3s¹

• 1s² 2s² 2p⁶ 3p¹

• 1s² 2s² 2p⁶ 3s¹

What is the difference between atomic mass and atomic weight?

• Atomic mass refers to a specific isotope's mass; atomic weight is the average mass of all isotopes.

• Atomic mass is the total number of protons and neutrons in an atom.

• Atomic mass and atomic weight are interchangeable terms for the same concept.

• Atomic weight is the mass of a single atom measured in atomic mass units.