Match each element to its electron dot diagram. The symbol X represents the element. Refer to the periodic table if needed.

Match each element to its electron dot diagram. The symbol X represents the element. Refer to the periodic table if needed.

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  1. Explanation:

    1.   In a periodic table, there are alkali metals, alkaline earth metals, transition metals, non-metals and noble gases. Also, lanthanides and actinides present in the periodic table are radioactive in nature.

    Therefore, MOST elements on the periodic table are metals.

    2.   Number of protons present in an atom represents the atomic number. On the other hand, sum of number of protons and neutrons represent atomic mass of an atom.

    When we move from left to right in a periodic table then there will be increase in number of both protons and neutrons. Hence, the periodic table organizes elements according to INCREASING atomic mass.

    3.   An atom which contains atoms of only one substance is known as an element.

    For example, Ca, Fe, Si and Ne are all elements.

    Whereas a substance that contains atoms of two different elements with similar composition is known as a substance.

    For example, CO, [tex]H_{2}O[/tex] are compounds.

  2. 35/15 D.
    A numeric in the upper left corner of chemical symbol stated for the atomic mass. The atomic mass is almost equal to a sum of protons and neutrons because electrons are not weighted much.

  3. 15 protons and 18 electrons.


    Atomic number of an element is defined as the number electrons or number of protons present in an atom of that particular element.

    So, in phosphorus atom there are 15 electrons and 15 protons.

    Number of protons and electrons are in a [tex]P^{3-}[/tex] ion:

    In a negative ion , total number of electrons are always greater than the total number of protons. In [tex]P^{3-}[/tex] ion '3-' charge means that ion is carrying extra three electrons than the electrons carried by the parent phosphorus atom.

    So, the total number of electrons in [tex]P^{3-}[/tex] ion =

    [tex]\text{number of electrons in parent atom}+|charge|[/tex]=15 + 3 = 18 electrons.

    Total number of protons will remain same in [tex]P^{3-}[/tex]ion as that of parent phosphorus atom = 15.

  4. periodic table is a classification system for the elements. ... The symbols are abbreviations of the origins of the word for each element. For example, the origin of lead's symbol, Pb, is the Latin word 'plumbum' meaning 'liquid silver'. The number above the symbol is the atomic mass (or atomic weight).

  5. the answer is e because the same variable, for example, x, can represent two different unknowns in two different algebraic expressions

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