Exploring Atomic Numbers and Properties

What is the definition of atomic number?

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

• The atomic number is the mass of an atom measured in atomic mass units.

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

• The atomic number is the number of neutrons in the nucleus of an atom.

How does atomic number relate to an element's identity?

• The atomic number is determined by the element's mass.

• The atomic number indicates the number of electrons in an atom.

• The atomic number uniquely identifies an element by the number of protons in its nucleus.

• The atomic number is the total number of neutrons in the nucleus.

What is the significance of the periodic table in chemistry?

• It categorizes elements based on their color.

• The periodic table is significant in chemistry as it provides a systematic arrangement of elements, facilitating the understanding of their properties and relationships.

• It predicts the weather patterns in chemistry.

• It lists elements in alphabetical order.

Describe the trend of atomic radius across a period.

• The atomic radius increases across a period.

• The atomic radius fluctuates randomly across a period.

• The atomic radius decreases across a period.

• The atomic radius remains constant across a period.

How does electronegativity change down a group in the periodic table?

• Electronegativity remains constant down a group.

• Electronegativity increases down a group.

• Electronegativity decreases down a group.

• Electronegativity fluctuates randomly down a group.

What is the general trend of ionization energy as you move across a period?

• Ionization energy increases across a period.

• Ionization energy decreases across a period.

• Ionization energy fluctuates randomly across a period.

• Ionization energy remains constant across a period.

Explain the concept of electron configuration.

• Electron configuration describes the chemical reactivity of an element.

• Electron configuration is the process of ionizing an atom.

• Electron configuration is the arrangement of electrons in an atom's orbitals.

• Electron configuration refers to the total number of protons in an atom.

What is the electron configuration for a carbon atom?

• 1s² 2s² 2p²

• 1s² 2s² 2p³

• 1s² 2s² 2p¹

• 1s² 2s² 2p⁴

How do electron configurations affect an element's reactivity?

• Electron configurations affect an element's reactivity by influencing how readily it gains, loses, or shares electrons to achieve stability.

• Electron configurations only affect the physical state of an element.

• Electron configurations have no impact on an element's mass.

• Electron configurations determine the color of an element.

What periodic trend is observed in metallic character?

• Metallic character decreases down a group and increases across a period.

• Metallic character remains constant across a period and down a group.

• Metallic character increases down a group and decreases across a period.

• Metallic character increases across a period and decreases down a group.