5.2: Classification of the Elements

Elements in the same group have similar properties because:

• they have the same number of protons.

• they have the same number of neutrons.

• they have the same number of valence electrons.

• they have the same atomic mass.

Tags

NGSS.HS-PS1-1

Which of the following is an alkali metal?

• Helium

• Sodium

• Iron

• Carbon

A halogen is a type of:

• Metal

• Noble gas

• Non-metal

• Alkali metal

A noble gas is:

• a type of metal

• a type of non-metal

• an inert (unreactive) gas

• a radioactive element

Which of the following is a characteristic of transition metals?

• They are all gases at room temperature.

• Nearly all are solid at room temperature.

• They are non-conductive.

• They are all radioactive.

What is an inner transition metal?

• A type of metal found in the s-block of the periodic table

• A type of metal found in the p-block of the periodic table

• A type of metal found in the d-block of the periodic table

• A type of metal found in the f-block of the periodic table

The arrangement of the periodic table reflects:

• the atomic number of elements

• the alphabetical order of elements

• the date of discovery of elements

• the color of elements

Tags

NGSS.HS-PS1-1

An element’s electron configuration, particularly regarding its valence electrons, determines its ________.

• chemical properties

• physical state

• atomic mass

• melting point

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the electron configuration for lithium?

• 1s² 2s¹

• 1s² 2p¹

• 1s¹ 2s²

• 1s² 2s²

What is the electron configuration for sodium?

• 1s² 2s² 2p⁶ 3s¹

• 1s² 2s² 2p⁶ 3p¹

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶ 2d¹