Atoms and the Periodic Table

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different mass numbers.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a valence electron?

Back

Valence electrons are the electrons in the outermost energy level of an atom that are involved in forming chemical bonds.

Front

What is the mass number?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

Who developed the planetary model of the atom?

Back

Niels Bohr developed the planetary model of the atom, which describes electrons orbiting the nucleus in defined paths.

Front

What charge does an atomic nucleus have?

Back

An atomic nucleus has a positive charge due to the presence of protons.

Front

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

Back

To find the number of neutrons, subtract the atomic number from the mass number (Neutrons = Mass Number - Atomic Number).

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number and grouped by similar properties.

Front

What are groups in the periodic table?

Back

Groups are vertical columns in the periodic table that contain elements with similar chemical properties and the same number of valence electrons.

Front

What are periods in the periodic table?

Back

Periods are horizontal rows in the periodic table that indicate the number of electron shells in the atoms of the elements.