The Periodic Table

General info

The are 07 rows (periods). Lanthanides & Actinides really belong to row 6th and 7th.

The number of element in each line are: 2, 8, 8, 18, 18, 32, 32

There are total 118 elements. All elements with atomic numbers higher than uranium (92) are considered artificial or synthetic elements

There are 18 columns (or groups). Groups contain similar elements.
Nếu dùng Roman number thì chỉ có 8 groups.

The gray diagonal "metal divider" on the periodic table is a stair-step line that separates metals from nonmetals, with metalloids positioned along the line. This line is not a formal chemical boundary, but rather a visual convention to illustrate the general trend in properties across the periodic table.

Metals on the left and non-metals on the right.

Hydrogen

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Group 1: Alkali Metals

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