Whois & Analysis for chem4kids.com

The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons), electron configurations, and recurring chemical properties.

This ordering shows periodic trends, such as elements with similar behaviour in the same column.

It also shows four rectangular blocks with some approximately similar chemical properties.

In general, within one row (period) the elements are metals on the left, and non-metals on the right.

Biochemistry, sometimes called biological chemistry, is the study of chemical processes within and relating to living organisms.

By controlling information flow through biochemical signaling and the flow of chemical energy through metabolism, biochemical processes give rise to the complexity of life.

Over the last decades of the 20th century, biochemistry has become so successful at explaining living processes that now almost all areas of the life sciences from botany to medicine to genetics are engaged in biochemical research.

Today, the main focus of pure biochemistry is on understanding how biological molecules give rise to the processes that occur within living cells, which in turn relates greatly to the study and understanding of tissues, organs, and whole organisms—that is, all of biology.

Chemistry is a branch of physical science that studies the composition, structure, properties and change of matter.

Chemistry includes topics such as the properties of individual atoms, how atoms form chemical bonds to create chemical compounds, the interactions of substances through intermolecular forces that give matter its general properties, and the interactions between substances through chemical reactions to form different substances.

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.

Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms.

Atoms are very small; typical sizes are around 100 picometers (a ten-billionth of a meter, in the short scale).

A chemical element or element is a species of atoms having the same number of protons in their atomic nuclei (i.e. the same atomic number, or Z).

There are 118 elements that have been identified, of which the first 94 occur naturally on Earth with the remaining 24 being synthetic elements.

There are 80 elements that have at least one stable isotope and 38 that have exclusively radioactive isotopes, which decay over time into other elements.

Iron is the most abundant element (by mass) making up Earth, while oxygen is the most common element in the Earth's crust.