Periodic Table Test

The periodic law states that:

• The periodic table arranges elements into periods and groups.
• The properties of elements recur periodically based on their metallic qualities.
• The properties of elements recur periodically when arranged by increasing atomic mass.
• The properties of elements recur periodically when arranged by increasing atomic number.

When atoms react, they often lose, gain, or share electrons to form a more stable version of themselves. For example, alkali metals such as Na lose their outer shell electron in their reactions to form compounds. The electron configuration of alkali metals would then resemble those of which group of the periodic table in the compounds they form?

• A
• 2A
• 7A
• 8A

In the periodic table hydrogen is placed and Group 1A and helium is placed in Group 8A. The most likely reason for this is:

• Hydrogen has one outer shell electron and helium has a full outer shell of electrons.
• Hydrogen has one outer shell electron and helium has 8 electrons in its outer shell.
• Hydrogen and helium are both metals.
• Hydrogen and helium are both gases.

The metallic character of elements _____ across a period. Metals are good conductors of ______.

• increases; electricity
• decreases; heat
• decreases; metalloids
• remains the same; luster

Cations are always _____ than the parent atom and anions are always _____ than the parent atom.

• smaller; smaller
• larger; smaller
• smaller; larger
• larger; larger

Lithium is in Group 1A, Period 2 of the periodic table. Which statement describes the charge of the ion it typically forms?

• It forms a cation with +2 charge.
• It forms a cation with a +1 charge.
• It forms an anion with a +1 charge.
• It forms an anion with a −1 charge.

The elements K, Ca, Se, Kr, and Ga all appear in Period 4 of the Periodic Table. Which arrangement, from left to right, orders them with respect to their atomic size, from largest to smallest?

• K; Ca; Se; Kr; Ga
• Ca; Ga; K, Kr; Se
• K; Kr; Se; Ca; Ga
• K; Ca; Ga; Se; Kr

Based on their definitions, electron affinity (to like something) could be considered the opposite of

• shielding effect.
• ionization energy.
• nonmetallic character.
• effective nuclear charge.

The labels on two bottles of powdered metals have fallen off. From the labels, the metals are known to be Mg and Ca. Your friend Jace says it is possible to determine which label should go on which bottle by observing the reaction between small amounts of each metal in separate beakers containing equal quantities of water. Considering particles at the subatomic level, carrying out this experiment would help to identify the metals given that: Ca has the ___ atomic radius. In chemical reactions, it would be ___ for it to lose its valence electrons to form ions. This means it has comparatively ___ ionization energies and would react more ___ with the water. Which list of words correctly completes (from left to right) the blanks in the passage?

• smaller; easier; higher; quickly
• larger; easier; lower; quickly
• smaller; harder; higher; slowly
• larger; harder; lower; slowly

A mystery element has 18 protons. Which one of the following statements is true about the element?

• The element belongs in row 2 of the periodic table and is classified as a halogen.
• The element belongs in row 3 of the periodic table and is classified as a noble gas.
• The element belongs in row 4 of the periodic table and is classified as an alkali metal.
• The element belongs in row 5 of the periodic table and is classified as an alkaline earth metal.