Periodic Table History and Trends

Front

What subatomic particle determines the identity of an element?

Back

Proton

Front

Which element is classified as a metalloid?

Back

Polonium

Front

What are the vertical columns of elements in the periodic table known as?

Back

Groups

Front

Which particles make up the nucleus of an atom?

Back

Protons and neutrons

Front

How many neutrons does Iron-60 (atomic number 26) have?

Back

34

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a period in the context of the periodic table?

Back

A horizontal row of elements.

Front

What is the significance of valence electrons?

Back

They determine how an element reacts chemically.

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 is an isotope?

Back

Atoms of the same element with different numbers of neutrons.