CHEMISTRY HIGH SCHOOL

Electrons located in the outermost shell of an atom are called _________ electrons. a. valence b. Border c. Octet d. rim

Answers

Answer 1
Answer: Valence shell (the only other answer you can really confuse this with is octet which refers to the outer electron shell of noble gases which are stable!)
Answer 2
Answer:

Final answer:

Valence electrons are the electrons located in an atom's outermost shell. They play a critical role in chemical bonding and reactions and determine the atom's reactivity and placement in the Periodic Table.

Explanation:

The electrons located in the outermost shell of an atom are correctly referred to as valence electrons. These electrons play a crucial role in chemical bonding and reactions because they are the most distant from the atom's nucleus and thus, the most loosely bound, making them available for interactions with other atoms. For instance, when atoms interact to form a chemical bond, the valence electrons are often the ones that are shared, transferred, or involved in the bond formation. The number of valence electrons in an atom also determines the atom's reactivity and its placement in the Periodic Table.

Learn more about Valence Electrons here:

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Half equation reaction for 2KI+Cl2-I2+2KCl

Answers

Answer:

Explanation:

2kc

Which of the following compounds is a structural isomer of butane?a. 2-methylbutane
c. 2-methylpropane
b. 2,2-dimethylbutane
d. 2,2-diethylpropane

Answers

The compound that is a structural isomer of butane is 2 – methylpropane. Note that butane has four carbon atoms. In 2 – methylpropane, propane has three carbon atoms and methyl is attached at the second carbon. Methyl has only one carbon atom and together, they have a total of four carbon atoms. An isomer is a substance that has the same number of atoms but they differ in their structure. The answer is letter C.

What element is this? How do you know?

Answers

Atom is the most basic unit of matter. They are the general term used to describe pieces of matter. But a different kind of atom makes up an element.  A combination of atom of different elements creates a molecule. For example, you have water; it has a chemical formula of H2O. If you separate H from O, you have two atoms. Two atoms for hydrogen and one atom for oxygen. However, they are of different elements. And when you combine them to form H2O, you create a molecule.

 

How many moles is 1.81 x 10^24 atoms of carbon?

Answers

Well a number you have to know is 6.02 x 10^23. That is how many atoms there are in a mole.

So if you have 1.81 x 10^24 atoms,
you divide that by 6.02 x 10^24 moles to get 3 moles

Using factor/label method:
1.81 x 10^24 atoms * 1 mol
                                   ------------------------   = 3 moles
                                   6.23 x 10^23 atoms
(As you can see, the unit "atoms" cancels out from the top and bottom.)

Given any two elements within a group, is the element with the larger atomic number likely to have a larger or smaller atomic radius than the other element

Answers

Answer:

Atomic radius of sodium = 227 pm

Atomic radius of potassium = 280 pm

Explanation:

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

Consider the example of sodium and potassium.

Sodium is present above the potassium with in same group i.e, group one.

The atomic number of sodium is 11 and potassium 19.

So potassium will have larger atomic radius as compared to sodium.

Atomic radius of sodium = 227 pm

Atomic radius of potassium = 280 pm

The bicycle is said to be the most energy-efficient means of transportation. Where does the energy that drives it come from?

Answers

The energy that drives the bicycle comes
from the food that the rider eats.
well the food that the person eats powers the mucles and the person uses their wieght/gravity to push down on the pedals which pulls the chain and, since the wheel is a diffarent size, you either get more power and less speed or more speed and less power
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