The Atom and Periodic Table Study Guide

Front

What is an alkali metal?

Back

Alkali metals are a group of elements in Group 1 of the periodic table, characterized by having one electron in their outermost shell. They are highly reactive and include elements like lithium, sodium, and potassium.

Front

What identifies an atom as hydrogen-2?

Back

An atom of hydrogen-2 (deuterium) is identified by its one proton, which is the defining particle of hydrogen.

Front

What are the negatively charged particles of an atom?

Back

Electrons are the negatively charged particles of an atom.

Front

What is found in the nucleus of an atom?

Back

The nucleus of an atom contains neutrons and protons.

Front

How many protons are in an atom with an atomic number of 15?

Back

An atom with an atomic number of 15 has 15 protons.

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 neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom, with no electric charge.

Front

What is a proton?

Back

A proton is a positively charged subatomic particle found in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

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

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, which shows the relationships between them.