Mendeleev's Periodic Table

What is the definition of a chemical element?

• A substance that can be broken down into simpler substances.

• A substance with a particular set of properties that cannot be broken down any further.

• A type of atom found only in laboratories.

• A random arrangement of particles.

Which scientist is known for creating a system to organize chemical elements?

• Albert Einstein

• Marie Curie

• Dmitri Mendeleev

• Isaac Newton

What property did Mendeleev primarily use to arrange elements in horizontal rows in his early periodic table?

• Atomic number

• Atomic weight

• Color

• Reactivity

What important feature did Mendeleev include in his periodic table that allowed him to predict the existence and properties of new elements?

• He only included elements that were already discovered.

• He left blank spaces for undiscovered elements.

• He arranged elements in a circular pattern.

• He grouped elements based on their state of matter.