[soul..]

ممكن حل دي السؤالين
؟؟
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() The mass of one molecule of fluorine gas is about:


الحل :

2 في 19 على عدد افوجادرو ..,

من فين جات 2 ؟؟

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(11) 23Na and 24Mg both have the same
(A) number of neutrons.
(B) number of electrons.
(C) atomic number.
(D) mass number.