In the Periodic Table of the elements, elements are arranged in a series of rows so that those with similar properties appear in vertical columns. This arrangement reflects the periodicrecurrence of similar properties as the atomic number increases. For example, the alkaline metals lie in one group (group 1) and share similar properties, such as high reactivity and the tendency to lose one electron to arrive at the noble gas electronic configuration.
Modern quantum mechanics explains these periodic trends in properties in terms of electron shells. As atomic number increases, shells fill with electrons in approximately the order shown below. The filling of each shell corresponds to a row in the table. 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p
In the s-block and p-block of the periodic table, elements within the same period generally do not exhibit trends and similarities in properties (vertical trends down groups are more significant). However in the d-block, trends across periods become significant, and in the f-block elements show a high degree of similarity across periods (particularly the lanthanides).[hide]v • d • e
Periodic tablesLayoutsStandard · Inline f-block · Vertical · Full names · Names and atomic weights · Text for last · Large table · Metals and nonmetals · Blocks · Valences · Extension beyond the 7th period · Electron configurations · Atomic weights · Electronegativities · Alternatives · Crystal structure
Lists of elements byName · Atomic symbol · Atomic number · Atomic weight · Name etymology (after places, after people) · Discovery
Boiling point · Melting point · Density · Oxidation state · Abundance (in humans) · Nuclear stability · Hardness
Groups1 (Alkali metals) · 2 (Alkaline earth metals) · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 (Boron group) · 14 (Carbon group) · 15 (Pnictogens) · 16 (Chalcogens) · 17 (Halogens) · 18 (Noble gases)
Periods1 · 2 · 3 · 4 · 5 · 6 · 7 · 8
Other element categoriesMetals · Transition metals (1st row · 2nd row · 3rd row · 4th row) · Metalloids · Nonmetals · Lanthanoids · Actinoids · Rare earth elements · Platinum group metals (PGMs) · Post-transition metals
Blockss-block · p-block · d-block · f-block
The periodic table of elements is organized by periods and families or groups this means that the periods stand for the valence electrons or negatively charged atoms known as electrons in the electrons shells in the electron cloud.
The horizontal rows are referred as periods. There are 7 periods in periodic table.
There are 7 periods in the modern periodic table.
Periods on the periodic table are the horizontal rows that go from left to right.
The horizontal sections of the periodic table are called periods.
The horizontal rows on the periodic table are called periods.
The rows in the periodic table are called periods. There are 7 periods in periodic table.
Periods have same shells. There are 7 periods in periodic table.
The periodic table has 7 periods on it.
rows. the vertical columns are called periods
The modern periodic table has seven periods.
The horizontal rows on the periodic table are periods.
Periods are horizontal rows. 7 periods are present in modern periodic table.
The horizontal rows are referred as periods. There are 7 periods in periodic table.
7The periodic table has 7 periods and 18 groups.
Yes. the horizontal rows on the periodic table are called periods.
They are the horizontal rows in the periodic table
There are 7 periods in the modern periodic table.