Development of the Periodic Table

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons, resulting in a different atomic mass.

Front

What does it mean if an atom is in Period 3 of the periodic table?

Back

It means that the atom has 3 electron shells.

Front

What information does the period number provide in the periodic table?

Back

The period number indicates the number of electron shells in an atom.

Front

How many electrons are in the outer shell of a bromine atom?

Back

Bromine has 7 electrons in its outer shell.

Front

If an element is in Group 6 and Period 3, how many total electrons does it have?

Back

The element has 16 electrons in total.

Front

What is the significance of the group number in the periodic table?

Back

The group number indicates the number of electrons in the outer shell of the elements in that group.

Front

What is the atomic number of an element?

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 relationship between atomic weight and isotopes?

Back

Atomic weight is a weighted average of the masses of an element's isotopes, taking into account their relative abundance.

Front

What are the main categories of elements in the periodic table?

Back

The main categories are metals, nonmetals, and metalloids.

Front

What is a chemical group in the periodic table?

Back

A chemical group (or family) is a column of elements that have similar chemical properties due to having the same number of electrons in their outer shell.