An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across. They are so small that accurately predicting their behavior using classical physics—as if they were tennis balls, for example—is not possible due to quantum effects.
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. In quantum physics, organic chemistry, and biochemistry, the distinction from ions is dropped and molecule is often used when referring to polyatomic ions.
Zinc is a chemical element with the atomic number 30 and the symbol Zn. At room temperature, zinc is a somewhat brittle metal with a silvery-greyish look when oxidation is eliminated. It is the first element in periodic table group 12 (IIB). Zinc is chemically similar to magnesium in various ways: both metals have just
Water is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth‘s hydrosphere and the fluids of all known living organisms. “Water” is the name of the liquid state of H2O at standard conditions for temperature and pressure. It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula H2O, indicates that
A chemical element, often simply called an element, is a species of atoms which all have the same number of protons in their atomic nuclei. Atomic number Symbol Name Phase at r.t. 1 H Hydrogen gas 2 He Helium gas 3 Li Lithium solid 4 Be Beryllium solid 5 B Boron solid 6 C Carbon solid 7 N Nitrogen gas 8
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Heads of state Current heads of state at the time of the release Ilham Aliyev, President of Azerbaijan Sebastián Piñera, President of Chile Denis Sassou Nguesso, President of the Republic of the Congo Nicos Anastasiades, President of Cyprus Luis Abinader, President of the Dominican Republic Guillermo Lasso, President of Ecuador Ali Bongo Ondimba, President of Gabon Abdullah II, King of Jordan Uhuru Kenyatta, President
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