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sahaitong2552
14.07.2020 •
Chemistry
8. Decide whether each statement is true (T) or false (F). Place your answer in the blank
space given
a.
An electron cannot fall into the nucleus under normal circumstances.
b. An electron in the outer energy level is called a valence electron.
c. Elements in the same period have the same number of valence electrons.
d. Positively charged ions are called anions.
e.
An isotope of an element has a different number of neutrons in its
nucleus.
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Ответ:
a false
B true
C false
D false
E false
Explanation:
Ответ:
Rises
serious
cost
antiretrovial therapies
stigma
Explanation: