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    Home > Biochemistry News > Biotechnology News > (Element) periodic table

    (Element) periodic table

    • Last Update: 2021-02-26
    • Source: Internet
    • Author: User
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    WordDefinitionTopic
    alkali metalsThe alkali metals are the elements in Group 1 of the periodic table. They have one electron in the outer shell. The periodic table
    atomAll elements are made of atoms. An atom consists of a nucleus containing protons and neutrons, surrounded by electrons. The periodic table
    atomic numberThe atomic number (Z) of an element is the number of protons in the nucleus of the atom. The periodic table
    atomsAll elements are made of atoms. An atom consists of a nucleus containing protons and neutrons, surrounded by electrons. The periodic table
    boiling pointThe temperature at which a liquid changes its state to gas. The periodic table
    brittleIf something is brittle it is easily broken. The periodic table
    catalystA catalyst changes the rate of a chemical reaction without being changed by the reaction itself. The periodic table
    catalytic converterA device in internal combustion engines which catalyses reactions converting harmful exhaust gases such as carbon monoxide into normal atmospheric gases. The periodic table
    compoundA compound is a substance formed by the chemical union (involving bond formation) of two or more elements. The periodic table
    conductTo allow electricity, heat or other energy forms to pass through. The periodic table
    conductorAn electrical conductor is a material which allows an electrical current to pass easily. It has a low resistance. A thermal conductor allows thermal energy to be transferred through it easily. The periodic table
    covalent bondA covalent bond between atoms forms when atoms share electrons to achieve a full outer shell of electrons. The periodic table
    displacement reactionsDisplacement reactions happen when a more-reactive element replaces a less-reactive element in a compound. The periodic table
    electronAn electron is a very small negatively-charged particle found in an atom in the space surrounding the nucleus. The periodic table
    elementAll atoms of an element have the same atomic number, the same number of protons and electrons and so the same chemical properties. The periodic table
    groupsThe groups of elements in the periodic table are the elements which have the same number of electrons in their outer shells and so have similar chemical properties. A group of elements all lie in same column in the periodic table. The periodic table
    halogensThe halogens are the elements in Group VII of the periodic table. They have seven electrons in the outer shell. The periodic table
    ionic compoundAn ionic compound occurs when a negative ion (an atom that has gained an electron) joins with a positive ion (an atom that has lost an electron). The ions swap electrons to achieve a full outer shell. The periodic table
    molecular compoundA molecular compound is made up of at least two different elements, which share electrons to form covalent bonds. The periodic table
    moleculeA molecule is a collection of two or more atoms held together by chemical bonds. It is the smallest part of a substance that displays the properties of the substance. The periodic table
    nucleusFound at the centre of an
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