Moore Unit 2: The Periodic Table

Front

What is the atomic number of an element?

Back

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

Front

What are the three main subatomic particles?

Back

The three main subatomic particles are protons (positively charged), neutrons (neutral), and electrons (negatively charged).

Front

What is the role of protons in an atom?

Back

Protons determine the atomic number and identity of an element, and they contribute to the positive charge of the nucleus.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus by offsetting the repulsive forces between protons.

Front

What is the role of electrons in an atom?

Back

Electrons are involved in chemical bonding and reactions; they occupy energy levels around the nucleus.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances and is made up of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, showing periodic trends.

Front

What does it mean for an atom to be stable?

Back

An atom is stable when its outer electron shell is full, typically having 8 electrons (octet rule).

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell of 8 electrons.