Periodic Table Concepts and Valence Electrons

Front

What are the vertical columns on the periodic table called?

Back

Groups

Front

What do the vertical columns on the periodic table tell us?

Back

The number of valence electrons (electrons on the outermost shell)

Front

If an isotope has an atomic number of 15 and a mass number of 31, how many neutrons does it have?

Back

16

Front

Who proposed a model with electrons moving in specific layers?

Back

Bohr

Front

How many valence electrons and energy levels does (Pb) lead have?

Back

4 valence electrons and 6 energy levels (orbitals)

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a valence electron?

Back

An electron in the outermost shell of an atom that can participate in chemical bonding.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What are periods in the periodic table?

Back

Horizontal rows that indicate the number of energy levels in an atom.

Front

What is an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.