Periodic Table Unit Review

Front

What is the significance of valence electrons in determining an element's chemical properties?

Back

Valence electrons are the outermost electrons of an atom and play a crucial role in chemical bonding and reactivity. The number of valence electrons determines how an element interacts with others.

Front

How many energy levels does an element with 2 valence electrons typically have?

Back

An element with 2 valence electrons typically has 3 energy levels.

Front

What are noble gases and why are they unique in the periodic table?

Back

Noble gases are elements in Group 18 of the periodic table, such as helium, neon, and argon. They are unique because they are nonreactive due to having a full valence shell.

Front

What characterizes the elements in Group 17 of the periodic table?

Back

The elements in Group 17, known as halogens, are characterized as very reactive nonmetals with similar chemical properties.

Front

Why is the periodic table considered a valuable tool for scientists?

Back

The periodic table is valuable because it organizes elements based on their properties and allows scientists to predict how they will react with one another.

Front

What is the general trend of reactivity among the halogens?

Back

Reactivity among halogens decreases as you move down the group in the periodic table.

Front

What is the electron configuration of Lithium, and how does it relate to its valence electrons?

Back

Lithium has an electron configuration of 1s² 2s¹, indicating it has 1 valence electron.

Front

How can you determine the number of valence electrons in an element using the periodic table?

Back

The number of valence electrons can often be determined by the group number of the element in the periodic table; for example, elements in Group 1 have 1 valence electron.

Front

What is the role of the periodic table in predicting chemical reactions?

Back

The periodic table helps predict chemical reactions by showing trends in reactivity, electronegativity, and ionization energy among elements.

Front

What are the properties of metals, nonmetals, and metalloids as categorized in the periodic table?

Back

Metals are typically shiny, conductive, and malleable; nonmetals are usually dull, insulative, and brittle; metalloids have properties intermediate between metals and nonmetals.