Answer:
(1) Carbon
Explanation:
Then we are looking for attraction of electrons in a bond towards one element, we are looking at polar covalent bonds and electronegativity of the compound elements.
Polar Covalent Bonds - A pair of electrons that are bonded and are unequally shared between the 2 elements. It's bond value is from 0.4 < x < 1.7.
Electronegativity - The ability of an atom in a molecule to attract shared electrons to itself. The general trend of increasing Electronegativity is up and to the right of the Periodic Table.
Carbon is Element 6 in Period 2 Group 14.
Nitrogen is Element 7 in Period 2 Group 15.
Oxygen is Element 8 in Period 2 Group 16.
Fluorine is Element 9 in Period 2 Group 17.
Remember our trend for Electronegativity. If that is the case, the Fluorine would be the most electronegative, meaning it would attract shared electrons and hold on to them very strongly. Therefore, it would have a very strong attraction for Hydrogen's lone electron, as Fluorine wants to fill it's valence electron shell fully, from 7 to 8.
Therefore, the least attraction and the least electronegative element in the list is Carbon.
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Bromine can be classified as a pure substance.
Why?
Bromine is an element with atomic number 35 on group 17 of the Periodic Table. That's the first sign that shows us that it is a pure substance.
But the fact that it has a clear and defined boiling and melting point is a sign that we are in the presence of a pure substance. Pure substances are characterized by defined boiling and melting points.
Mixtures usually have a range of temperatures in which they melt and boil.
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Answer:
In order to determine the rate at which the sediment layers were deposited
Explanation:
Iridium is an important element that belongs to the Platinum group and they are dominantly present in the asteroids and comets. They are the key evidence that suggests the occurrence of an asteroidal impact or a mass extinction event that has taken place in the geological past.
The presence of Iridium mixed with the clay sediments in the boundary between the Cretaceous and Tertiary (K-T boundary) suggested the mass extinction event that wiped out numerous life forms from the earth.
The famous scientist Dr. Luis Walter Alvarez suggested measuring the concentration of Iridium in this K-T boundary in order to determine the rate at which these sediment layers were deposited. They were able to determine that these Iridium elements were present due to the asteroid impact on earth, that wiped out the dinosaurs from the earth. They also considered that this element can be produced from the eruptions of volcanoes.
Answer:
The presence of Iridium mixed with the clay sediments in the boundary between the Cretaceous and Tertiary (K-T boundary) suggested the mass extinction event that wiped out numerous life forms from the earth.
The famous scientist Dr. Luis Walter Alvarez suggested measuring the concentration of Iridium in this K-T boundary in order to determine the rate at which these sediment layers were deposited. They were able to determine that these Iridium elements were present due to the asteroid impact on earth, that wiped out the dinosaurs from the earth. They also considered that this element can be produced from the eruptions of volcanoes.
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Explanation:Iridium is a component of cosmic dust that rains down upon the earth at a constant rate. Why did Luis Alvarez suggest measuring iridium levels in the K-T boundary?