Unit 1.3- The Periodic Table (1-22) ALL

Front

What are Noble Gases and why are they considered unreactive?

Back

Noble Gases are elements in Group 18 of the periodic table that have a full shell of valence electrons, making them stable and unreactive under normal conditions.

Front

Name a Noble Gas and its atomic number.

Back

Helium (He) has an atomic number of 2.

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

How do you calculate the number of neutrons in an atom?

Back

To calculate the number of neutrons, subtract the number of protons from the atomic mass of the element.

Front

Who is Mendeleev and what was his contribution to the periodic table?

Back

Dmitri Mendeleev was a Russian chemist who arranged the elements in the periodic table by increasing atomic mass and grouped them by similar chemical properties.

Front

What is the significance of a full valence shell in terms of chemical reactivity?

Back

A full valence shell indicates that an atom is stable and less likely to react with other elements.

Front

List the first three Noble Gases in the periodic table.

Back

The first three Noble Gases are Helium (He), Neon (Ne), and Argon (Ar).

Front

What is the relationship between atomic mass and the number of neutrons?

Back

The atomic mass is approximately equal to the sum of protons and neutrons in an atom; thus, the number of neutrons can be found by subtracting the number of protons from the atomic mass.

Front

What is the periodic table and what information does it provide?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, which provides information about the elements' properties, atomic mass, and their relationships.

Front

Explain the term 'valence electrons'.

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.