(03.02 LC) Lithium has a 1+ charge, and oxygen has a 2− charge. A Lewis dot diagram should contain one lithium atom and two oxyg
en atoms to show how these atoms form an ionic bond. True False
2 answers:
Answer: The statement is false.
Explanation:
Atomic number of lithium is 3 and its electronic distribution is 2, 1. Therefore, lithium has only one electron to donate.
Whereas atomic number of oxygen is 8 and its electronic configuration is 2, 6.
So, oxygen needs two more electrons to complete its octet. Thus, two lithium atoms will donate each valence electron to an oxygen atom.
Hence, there will be two lithium atoms and one oxygen atom in a molecule of lithium oxide . Though there is sharing of electrons so the bond formed will be ionic bond.
Therefore, we can conclude that the statement a Lewis dot diagram should contain one lithium atom and two oxygen atoms to show how these atoms form an ionic bond is false.
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Answer:
Explanation:
When converting from moles to atoms, we must use Avogadro's number. This number tells us there are 6.022 * 10²³ atoms in 1 mole. We can multiply this number by the number of moles.
First, we must set up Avogadro's number as a ratio.
Next, multiply the number of moles by the ratio.
When we multiply, the moles of silicon will cancel.
Since the denominator of the fraction is 1, we can cancel it out too.
The original measurement (2.5 moles) has 2 significant figures (2 and 5). Therefore we must round to 2 sig figs. For this question, 2 sig figs is the tenth place.
The 0 in the hundredth place tells us to leave the 5 in the tenth place.
There are about <u>1.5 * 10²⁴ atoms of silicon.</u>