CORRECTED Periodic Table Study Guide

Refer to the Periodic Table. The element located in Period 4 and Group 6 is (a)   .

• Chromium

• Iron

• Copper

• Zinc

Answer explanation

The element in Period 4 and Group 6 of the Periodic Table is Chromium (Cr). It is the only element among the choices that fits this classification, while Iron, Copper, and Zinc belong to different groups.

Refer to the Periodic Table. The element with 3 energy levels and 6 valence electrons is (a)   .

• Sulfur

• Oxygen

• Selenium

• Tellurium

Answer explanation

Sulfur has 3 energy levels (n=3) and 6 valence electrons in its outer shell, making it the correct choice. Oxygen has 2 energy levels, Selenium has 4, and Tellurium has 5, so they do not fit the criteria.

The horizontal rows in the periodic table are known as (a)   .

• Periods

• Groups

• Elements

• Blocks

Answer explanation

The horizontal rows in the periodic table are called periods. Each period represents a different energy level of electrons in the atoms of the elements, distinguishing them from groups, which are vertical columns.

The elements in Group 1 of the Periodic Table are known as (a)  

• alkali metals

• noble gases

• halogens

• transition metals

Answer explanation

The elements in Group 1 of the Periodic Table are called alkali metals. They are highly reactive and include lithium, sodium, and potassium, among others. The other options do not belong to Group 1.

The periodic table information that indicates the number of protons in a carbon atom is the (a)  

• Atomic number

• Atomic mass

• Electron configuration

• Group number

Answer explanation

The atomic number of an element indicates the number of protons in its nucleus. For carbon, the atomic number is 6, meaning it has 6 protons. This distinguishes it from other elements on the periodic table.

(a)   is a noble gas.

• Helium

• Oxygen

• Nitrogen

• Carbon Dioxide

Answer explanation

Helium is a noble gas, characterized by its lack of reactivity due to a full valence shell of electrons. In contrast, oxygen, nitrogen, and carbon dioxide are not noble gases and are reactive.

The classification of elements that share characteristics with both metals and nonmetals, such as silicon, is called (a)   .

• Metalloids

• Metals

• Nonmetals

• Noble gases

Answer explanation

The classification of elements that share characteristics with both metals and nonmetals is called metalloids. Silicon is a prime example of a metalloid, exhibiting properties of both categories.

Each group of elements on the Periodic Table has unique properties based on the number of (a)   electrons.

• valence

• core

• inner

• outer

Answer explanation

The unique properties of each group of elements in the Periodic Table are determined by the number of valence electrons. Valence electrons are the outermost electrons involved in chemical bonding, influencing reactivity and properties.

The atomic mass number of a carbon atom is (a)  

• 12

• 14

• 16

• 18

Answer explanation

The atomic mass number of a carbon atom is 12, which corresponds to its most common isotope, carbon-12. This number represents the total number of protons and neutrons in the nucleus.

As you move across the periodic table from left to right, the characteristics of the elements change. The correct sequence, moving from left to right in the third period, is (a)  

• Sodium, Magnesium, Aluminum, Silicon

• Argon, Chlorine, Sulfur, Phosphorus

• Chlorine, Argon, Sulfur, Phosphorus

• Sodium, Magnesium, Silicon, Aluminum

Answer explanation

The correct sequence moving from left to right in the third period of the periodic table is Sodium, Magnesium, Aluminum, and Silicon, as they are the first four elements in that period.