Periodic Table Quiz

In his periodic table, Mendeleev did not list all of the elements in order of increasing atomic mass because he wanted to group together elements with similar

• properties.

• atomic numbers.

• isotopes.

• charges.

A new group was added to Mendeleev’s periodic table after the discovery of

• alkali metals.

• electrons.

• noble gases.

• atomic nuclei.

Moseley discovered that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing

• atomic mass.

• density.

• radioactivity.

• atomic number.

As the atomic number increases within a group of elements, the atomic radius

• generally increases.

• remains generally constant.

• decreases regularly.

• varies unpredictably.

For each successive electron removed from an atom, the ionization energy

• increases.

• decreases.

• remains the same.

• equals the nuclear charge.

The halogens are located on the periodic table in Group

• 1.

• 2.

• 17.

• 18.

The number of valence electrons for Group 2 elements is

• 2.

• 8.

• n−1.

• equal to the period number.

The elements with atomic numbers from 58 through 71 in the periodic table are called the

• lanthanides

• actinides

• alkali metals

• noble gases

Since the first energy level contains only the 1s sublevel, the number of elements in this period is

• 2

• 1

• 3

• 4

The electron configuration of an element in its ground state is [Ar]3d^104s^24p^5. This element is in the

• fourth

• third

• fifth

• sixth