Prelims - The Periodic Table of Elements

Periodic table

Periodic table

a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties.

Dmitri Mendeleev

The Periodic Table of Elements was introduced by

1869

When was The Periodic Table of Elements introduced?

65 elements

initial number of elements in the periodic table

118

As of 2019, there are # known elements

Oganeeson

Element 118

Atomic number (Z)

the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

Atomic mass (A)

It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

7

# of periods in the periodic table

Period

The ____ tells us the energy level of the element’s valence electron/s. It tells us the shell being occupied by the outermost shell.

Blocks

a set of elements unified by the atomic orbitals their valence electrons lie in (s, d, p, f).

Alkali metals

(group 1)

Alkaline-earth metals

(group 2)

Lanthanides

(part of group 3

Actinides

(part of group 3

Transition metals

(groups 3-12)

Post-transition metals

(groups 13-17 – 13,15,16,17)

Metalloids

(groups 13-17 – 13,14,15)

Non-metal groups

(group 14-16)

Halogen

(group 17)

Noble gases

(group 18)