Front

What is the definition of a noble gas?

Back

Noble gases are elements in Group 18 of the periodic table that are characterized by their lack of reactivity due to having a full valence shell of electrons.

Front

What is the charge of an electron?

Back

The charge of an electron is negative.

Front

How many valence electrons does a sodium atom have?

Back

A sodium atom has 1 valence electron.

Front

Which group of non-metals is the most reactive?

Back

The most reactive group of non-metals is the Halogens.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have different numbers of neutrons.

Front

What is the atomic structure of an atom?

Back

An atom consists of a nucleus containing protons and neutrons, surrounded by electrons in energy levels.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.

Front

What is the difference between an ion and an atom?

Back

An ion is an atom that has gained or lost one or more electrons, resulting in a net charge, while an atom is neutral.

Front

What is the maximum number of electrons that can occupy the first energy level?

Back

The maximum number of electrons in the first energy level is 2.

Front

What is the significance of valence electrons?

Back

Valence electrons determine an atom's chemical properties and its ability to bond with other atoms.