Periodic Trends

Front

What is ionization energy?

Back

The energy required to remove an electron from an atom in its gaseous state.

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 is the octet rule?

Back

Atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons.

Front

How do atoms complete the octet rule?

Back

They lose or gain electrons in the outermost level.

Front

What is atomic radius?

Back

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

Front

Which atom has the largest atomic radius in Group 18?

Back

Radon (Rn).

Front

What is electron affinity?

Back

The amount of energy released when an electron is added to a neutral atom.

Front

Put these in order of increasing electron affinity: B, N, F.

Back

B < N < F.

Front

What happens to atomic size as you move down a group in the periodic table?

Back

Atoms get larger because they have more energy levels.

Front

What is the trend in ionization energy across a period?

Back

Ionization energy generally increases from left to right across a period.