Periodic Trends

Front

What is a periodic trend?

Back

A predictable pattern in the properties of elements as you move across or down the periodic table.

Front

What are the four main periodic trends?

Back

Atomic radius, ionization energy, electronegativity, and electron affinity.

Front

Define atomic radius.

Back

The distance from the nucleus of an atom to the outermost shell of electrons.

Front

How does atomic radius change across a period?

Back

It decreases from left to right due to increased nuclear charge pulling electrons closer.

Front

How does atomic radius change down a group?

Back

It increases down a group due to the addition of energy levels.

Front

What is ionization energy?

Back

The energy required to remove an electron from an atom.

Front

How does ionization energy change across a period?

Back

It increases from left to right due to increased nuclear charge.

Front

How does ionization energy change down a group?

Back

It decreases down a group due to increased distance from the nucleus.

Front

What is electronegativity?

Back

A measure of the ability of an atom to attract electrons in a chemical bond.

Front

How does electronegativity change across a period?

Back

It increases from left to right.