Periodic Trends

Front

What is the atomic radius?

Back

The atomic radius is one-half the distance between the nuclei of identical atoms that are bonded together.

Front

Which element has the largest atomic radius in Period 4?

Back

Potassium (K) has the largest atomic radius in Period 4.

Front

What trend is observed in atomic radius as you move down a group in the periodic table?

Back

Atomic radius increases as you move down a group due to the addition of electron shells.

Front

What trend is observed in atomic radius as you move across a period from left to right?

Back

Atomic radius decreases as you move from left to right across a period due to increased nuclear charge.

Front

Which halogen has the smallest atomic radius?

Back

Fluorine (F) has the smallest atomic radius among the halogens.

Front

What is a group or family in the periodic table?

Back

A group or family is a vertical column in the periodic table that contains elements with similar chemical properties.

Front

Why are noble gases considered the least reactive elements?

Back

Noble gases are the least reactive because they have a full outer shell of electrons.

Front

What is the significance of valence electrons in determining chemical reactivity?

Back

Valence electrons determine how an element will react chemically; elements with full valence shells are less reactive.

Front

What is the periodic law?

Back

The periodic law states that the properties of elements are a periodic function of their atomic numbers.

Front

What is the difference between a period and a group in the periodic table?

Back

A period is a horizontal row, while a group is a vertical column in the periodic table.