Periodic Table Basics

Front

Which scientist created the first periodic table?

Back

Dmitri Mendeleev

Front

A boron atom would have ___ protons and ___ electrons.

Back

5, 5

Front

The first energy shell can hold up to __ electrons. The second energy shell can hold up to __ electrons. The third energy shell can hold up to __ electrons.

Back

2, 8, 18

Front

The atomic number tells you the number of protons or _____ in a neutral atom of that element.

Back

electrons

Front

You can find the _____ an atom has by subtracting 'atomic mass - number of protons'.

Back

number of neutrons

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 periodic table organize?

Back

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

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the significance of the periodic table's groups?

Back

Groups (columns) in the periodic table contain elements with similar chemical properties and the same number of valence electrons.

Front

What is the significance of the periodic table's periods?

Back

Periods (rows) in the periodic table indicate the number of electron shells in the atoms of the elements.