Group 4A (or 14) elements have _________ electrons in their valence shell. A. 2 B. 3 C. 4 D. 5
2 answers:
Answer: Option (C) is the correct answer.
Explanation:
Elements of group 4A include carbon, silicon, germanium, tin and lead.
Also, it is known that valence shell is the shell which is present in the outermost side of an element.
Hence, the electrons present in this outermost shell are known as valence electrons.
For example, atomic number of carbon is 6 and its electronic configuration is .
This means that there are 4 electrons present in the outermost shell.
Thus, we can conclude that group 4A (or 14) elements have 4 electrons in their valence shell.
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18 g of silicon-32 will be present in 800 years.
A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and it's given by
where,
quantity of the substance remaining
the initial quantity of the substance
time elapsed
the half-life of the substance
From the given information we know:
The initial quantity of silicon-32 is 40 g.
The time elapsed is 800 years.
The half-life of silicone-32 is 710 years.
So, using the calculation above, we can determine how much silicon-32 is left.
Therefore,18 g of silicon-32 will be present in 800 years.
Learn more about half-life here:
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