1. An atom of an elephant has atomic mass of 39 and has number of neutrons as 20 calculate protons number. 2. An atom of an elephant h

Question

1. An atom of an elephant has atomic mass of 39 and has number of neutrons as 20 calculate protons number.
2. An atom of an elephant has the atomic number of 13 and 14 neutrons
A. What is the mass number
B. write the nuclear notation given the atoms as X.
C. How many electrons does atom X have?
D. what is number of protons.

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Hưng Khoa 5 years 2021-07-27T17:15:22+00:00 1 Answers 28 views 0

Answers ( )

  1. thongdat2
    0
    2021-07-27T17:16:51+00:00
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    Answer:

    See Explanation

    Explanation:

    1) Let us recall that;

    Mass number = number of protons + number of neutrons

    Where;

    Number of protons = ?

    Number of neutrons =20

    Mass number =39

    Number of protons = mass number – number of neutrons

    Mass of protons =39 – 20= 19 protons

    2) Atomic number = 13

    Number of neutrons =14

    Then the mass number =13 +14 =27

    The symbol of the element is 27X13

    The number of protons= the number of electrons =13

    The atomic number is the same as the proton number =13

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