Understanding Chemical Elements and Periodic Table

Front

What is the total number of atomic numbers in the periodic table?

Back

118

Front

What does ionization energy measure?

Back

The amount of energy needed to remove an electron from a neutral atom.

Front

What do physical properties of a substance indicate?

Back

They tell us how a substance behaves under certain conditions without altering its composition.

Front

What is the approximate atomic mass of a carbon atom with 6 protons and 6 neutrons?

Back

12

Front

In a group of alkali metals, how does reactivity change as you move down the group?

Back

Reactivity increases from top to bottom.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the periodic table?

Back

A tabular arrangement of chemical elements, organized by increasing atomic number.

Front

What is atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What are isotopes?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

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

Back

It indicates the number of valence electrons in the elements of that group.