Atomic Theory and the Periodic Table Exam Review

Front

What is the main reason hydrogen is placed in group 1 (1A) of the periodic table?

Back

Hydrogen and alkali metals each have one electron in their outermost shell.

Front

What does the atomic number of an element represent?

Back

The atomic number represents the number of protons in the nucleus of an atom.

Front

Which element is grouped with sodium in the periodic table?

Back

Potassium is grouped with sodium.

Front

How many electrons does a phosphorus (P) atom have?

Back

A phosphorus atom has 15 electrons.

Front

What characteristic describes neon as a noble gas?

Back

Neon is nonreactive.

Front

What is the definition of an atomic mass unit (amu)?

Back

An atomic mass unit is a standard unit of mass that quantifies mass on an atomic or molecular scale.

Front

What is the significance of the periodic table's groups?

Back

The groups in the periodic table categorize elements based on similar chemical properties.

Front

What is the electron configuration of carbon?

Back

The electron configuration of carbon is 1s² 2s² 2p².

Front

What are alkali metals known for?

Back

Alkali metals are known for being highly reactive and having one electron in their outermost shell.

Front

What is a characteristic of noble gases?

Back

Noble gases are characterized by their lack of reactivity due to having a full valence shell.