Directions: Write the number that will make each statement correct. 1. Carbon has an atomic number of
2. Each atom of carbon contains
electrons.
3. A carbon atom has
valence electrons.
4. There are
naturally occurring isotopes of Carbon.
5. Carbon-14 is a radioactive carbon isotope that contains
of neutrons.
130
450
Ответы на вопрос:
составим пропорцию
12л -4 кг
21л- хкг
12х=21*4
12х=84
х=84: 12
х=7
ответ: 7 кг
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