Answer:
Option B
Explanation:
First, we need to know what is an energy level.
An energy level corresponds to the row of the periodic table of element. So, if you see the attached picture, you can see that we have 7 rows where the elements are distributed, so, we have 7 energy levels for all those elements.
Knowing that, the sub levels are the caps where the electrons of the atoms are carried. These sublevels or caps, are called orbitals, these can be of several types
s orbytal: can hold 2 electrons
p orbytal: can hold up to 6 electrons.
d orbytal: can hold up to 10 electrons
f orbytal: can hold up to 14 electrons
g orbytal: can hold up to 18 electrons.
Depending on the row (or energy level) and the atom, we can know how many electrons can carry an element, in which period or row is, and the sub levels. For example, the Chlorine, with an atomic number of 17, can carry up to 7 electrons in it's outer level and it's on the third row (two energy levels). This can be known with it's electronic configuration:
[Cl] = 1s^2 2s^2 2p^6 3s^2 3p^5
The last energy level is 3, so it's the third period, and the electrons of those sub level are 2 and 5, 7 electrons.
Hope this can help better
Answer:
One conclusion from Rutherford's experiment that greatly contradicted Thompson's experiment is that 'atoms are mostly empty space, with positively charged nucleus'.
Explanation:
(1) formula masses
(2) molecular polarities
(3) pH values
(4) specific heats
Answer: option 2. molecular polarities
Explanation:
The liquids hexane and water are placed in a test tube. The test tube is stoppered, shaken, and placed in a test tube rack. The liquids separate into two distinct layers because hexane and water have different molecular polarities. The answer is number 2.
2. Ba2SO4
3. BaSO4
4. Ba(SO4)2
Answer:
3. BaSO4
Explanation:
the math will show you, and to answer your commented question "How does this evidence indicate that the reaction has occurred between ions ?" :
The reaction of the ions can be checked by a number of methods. In a chemical reaction, the ions are in the aqueous solution. This means that they are in solution, dissolved with charge. During the reaction (ionic) there is an attraction between the positive and negative ions. This makes a change in the state of the reactants in the products. In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.
150 J
B.
270 J
C.
1350 J
D.
2250 J
The formula that can be applied in this problem is W = Fd where W is work, F is the force and d is distance. You have 450N and 3m, all you have to do is to multiply it.
W = Fd
W = (450N) (3m)
W = 1350J
The answer is letter C.