2.1 The Periodic Table

Who published the first version of the Periodic Table of the Elements in 1869?

• Marie Curie

• Dmitri Mendeleev

• Niels Bohr

• Henry Moseley

What is the basis for organizing the elements in the modern periodic table?

• Atomic weight

• Number of neutrons

• Increasing atomic number

• Number of electrons

How many periods are there in the modern periodic table?

• 7

• 8

• 6

• 5

What determines the chemical reactivity and properties of an element?

• Number of protons

• Atomic weight

• Valence electrons

• Number of neutrons

Which group of elements are known as the representative elements?

• Group VA through VIIIA

• Lanthanide and actinide series

• Group IA through VIIIA

• Transition elements

What is the electron configuration of an element in Group VA?

• s²p⁵

• s²p⁴

• s²p³

• s²p²

In the modern IUPAC identification system, how are the groups numbered?

• 1 to 16

• 1 to 10

• 1 to 8

• 1 to 18

Which subshells do the transition elements have valence electrons in?

• s and f

• s and d

• p and d

• s and p

What is the electron configuration of chromium?

• 4s² 3d⁵

• 4s¹ 3d⁵

• 4s² 3d⁴

• 4s¹ 3d⁴

What is the electron configuration of copper?

• 4s² 3d⁵

• 4s¹ 3d¹⁰

• 4s² 3d⁸

• 4s¹ 3d¹