The Periodic Table -2024

Front

Who is known for proposing the atomic theory?

Back

John Dalton proposed the atomic theory, which states that all matter is made up of atoms.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What does the atomic mass of an atom represent?

Back

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

Front

Who discovered the electron?

Back

J.J. Thomson discovered the electron in 1897.

Front

What is the mass number of an atom?

Back

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

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 is a chemical symbol?

Back

A chemical symbol is a one or two-letter abbreviation used to represent an element.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What are groups in the periodic table?

Back

Groups are vertical columns in the periodic table that contain elements with similar chemical properties.

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 elements.