Unit 6: Periodic Table & Trends

Front

Which halogen is found in period 4?

Back

Bromine (Br)

Front

What does the atomic radius increase down a group?

Back

There are more electrons and energy levels.

Front

Periodic law states that the elements are arranged according to their atomic ________ so that elements with similar chemical properties are in the same ________ and properties repeat periodically.

Back

numbers, column

Front

Why does the atomic radius decrease across a period?

Back

There are more protons in the nucleus that pull electrons closer.

Front

Francium (Fr) has the lowest ionization energy in Group 1 because -

Back

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

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom.

Front

Define ionization energy.

Back

The energy required to remove an electron from an atom.

Front

What trend is observed in ionization energy across a period?

Back

Ionization energy generally increases across a period.

Front

What is electronegativity?

Back

A measure of the tendency of an atom to attract a bonding pair of electrons.

Front

How does electronegativity change down a group?

Back

Electronegativity decreases down a group.