2.1a The Periodic Table

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

• Niels Bohr

• Marie Curie

• Dmitri Mendeleev

• Henry Moseley

How are the elements organized in the modern periodic table?

• Based on atomic weight

• Based on increasing atomic number

• Based on number of electrons

• Based on number of neutrons

What is the periodic law?

• The elements are arranged in periods and groups

• The chemical and physical properties of the elements are dependent on their atomic numbers

• The elements in the same group have the same number of protons

• The elements in the same period have the same number of electrons

How many periods are there in the modern periodic table?

• 6

• 5

• 7

• 8

What are the valence electrons?

• The electrons in the middle shell

• The electrons in the outermost shell

• The electrons in the nucleus

• The electrons in the innermost shell

What do the valence shell electrons largely determine?

• Atomic weight

• Physical properties

• Chemical reactivity and properties

• Number of protons

What do the Roman numerals above each group represent?

• Number of neutrons

• Number of valence electrons

• Number of protons

• Number of electrons in the nucleus

What are the representative elements also known as?

• Group B elements

• Transition elements

• Lanthanide and actinide series

• Group A elements

Where do the nonrepresentative elements have their valence electrons?

• s and p subshells

• s and d subshells

• s and f subshells

• p and d subshells

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

• 1 to 10

• 1 to 15

• 1 to 18

• 1 to 20