Review - Atoms and Electron City

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus made of protons and neutrons, surrounded by electrons in energy levels.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom. The number of protons determines the atomic number and the identity of the element.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom. They contribute to the atomic mass but do not affect the charge of the atom.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom in energy levels. They are involved in chemical bonding and reactions.

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 the mass number?

Back

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

Front

How many electrons can the first energy level hold?

Back

The first energy level can hold a maximum of 2 electrons.

Front

How many electrons can the second energy level hold?

Back

The second energy level can hold a maximum of 8 electrons.

Front

What is an ion?

Back

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

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond formed when two atoms share one or more pairs of electrons.