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brianogle4069
25.07.2019 •
Chemistry
2.18 determine whether each of the following statements is
true or false; if false, correct the statement to make it
true: (a) the nucleus has most of the mass and compris-
es most of the volume of an atom; (b) every atom of a
given element has the same number of protons; (c) the
number of electrons in an atom equals the number of
neutrons in the atom; (d) the protons in the nucleus of
the helium atom are held together by a force called the
strong nuclear force.
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Ответ:
(a) The nucleus has most of the mass and comprises most of the volume of an atom; false
The nucleus has most of the mass but the volume of an atom is depends on the distance between the nucleus and the position of the electrons.
(b) Every atom of a given element has the same number of protons; true
They may have different number of neutrons and so you have isotopes but the number of protons remain the same for a given element.
(c) The number of electrons in an atom equals the number of neutrons in the atom; false
The number of electrons in an atom equals the number of protons in the atom.
The electrons are negatively charged which compensate the positively charged protons not the neutrons which do not have a charge (they are neutral).
(d) The protons in the nucleus of the helium atom are held together by a force called the strong nuclear force. true
Ответ: