Atoms and the Periodic Table

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.

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 do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the symbol for sodium?

Back

The symbol for sodium is Na.

Front

What charge does an atomic nucleus have?

Back

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

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What are energy levels in an atom?

Back

Energy levels are the fixed distances from the nucleus where electrons can be found, corresponding to different energy states.

Front

Which element has 3 energy levels with electrons?

Back

Aluminum (Al) has 3 energy levels with electrons.

Front

What is a proton?

Back

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