Periodic Trends Rules and Compare

Front

What is atomic radius?

Back

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

Front

List the elements in order of increasing atomic radius: Cs, S, Co.

Back

S, Co, Cs

Front

What is electronegativity?

Back

Electronegativity is the ability of an atom to attract or accept electrons.

Front

How does atomic radius change across a period in the periodic table?

Back

As you move from left to right across a period, the atomic radius decreases.

Front

Why does atomic radius decrease across a period?

Back

The number of protons increases, leading to a stronger attraction between the nucleus and electrons.

Front

Which element has a higher electronegativity than arsenic (As)?

Back

Carbon (C) has a higher electronegativity than arsenic.

Front

What is ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom.

Front

Why does Francium (Fr) have the lowest ionization energy in Group 1?

Back

Its 1 valence electron is very far from the nucleus, so little energy is needed to remove it.

Front

What trend is observed in ionization energy as you move down a group in the periodic table?

Back

Ionization energy generally decreases as you move down a group.

Front

What is the trend of electronegativity as you move across a period?

Back

Electronegativity generally increases as you move from left to right across a period.