B . microscope
this is the answer .
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized
I believe the correct answer would be option 4. The only statement that is true would be that it is difficult to responsibly dispose of nuclear waste products. This is because nuclear waste products are radioactive and are very harmful to the society and to the environment. It could cause serious damage to every being in contact to it.
Answer:
A.
Explanation:
The number of the them will result in A.
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