Which Statement Describes The Electron Sea Model For Metallic Bonding? -This Model Involves Electrons (2023)

Answer: Option (D) is the correct answer.

Explanation:

Atomic number of lithium is 3 and electrons in its shell are distributed as 2, 1. Atomic number of chlorine is 17 and electrons in its shell are distributed as 2, 8, 7.

Thus, we can see that lithium has 1 extra electron and chlorine has deficiency of 1 electron. Therefore, in order to gain stability lithium will transfer its 1 extra electron to chlorine atom.

Thus, we can conclude that electrons are transferred from the lithium atom to the chlorine atom.

Best Answer
C) is the best description, although a scientific theory is not necessarily a "fact". They are, however, based on evidence.

A) is complete garbage.

B) is a good description of a scientific "law"- something that predicts how a certain event will occur without explaining why this is (for instance, the law of gravity accurately describes the gravitational forces between two bodies, but does not explain why these forces are there).

D) is a scientific "hypothesis"- an explanation for an observed phenomena that is yet to be proven.

The correct statement is C) A theory changes based on new observations and testing.

FURTHER EXPLANATION

A) A theory states how something behaves without explaining why.

FALSE because a theory is actually a statement that explains why an observed phenomenon happens. A statement or an observation of how something behaves without explanation is a scientific law, not a theory.

B) A theory is a proven fact that cannot be changed.

FALSE because a theory may be changed or proven false if new evidence that contradicts or debunks the existing theory comes to light. An example is the development from Classical Mechanics to Special Relativity to the Theory of General Relativity with each subsequent theory providing explanations to situations the preceding could not.

C) A theory changes based on new observations and testing.

TRUE because a theory is only valid when a lot of data support it. If new observations challenge the theory, then it may be changed or abandoned.

D) A theory is based on a single hypothesis or observation.

FALSE because a theory is considered as the best explanation for a phenomenon so far. For it to be considered the “best” it has to have been peer-reviewed and repeatedly tested and verified by the scientific community.

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Keywords: theory, scientific method

The element that is placed in the same period as ruthenium but which has a higher atomic number than it is SILVER.

In the periodic table, a period refers to an horizontal row of elements. All the element in a particular period always have the same number of atomic orbitals. Ruthenium and silver are in the same period and they have the same number of atomic orbital but have different atomic numbers. The atomic number of silver [47] is higher than that of ruthenium [44] because silver has higher number of protons more than ruthenium. Remember that, the number of proton of an element determines its atomic number and the elements in the periodic table are arranged based on increased atomic number.

Answer: The ion formed after the reduction of bromine is

Explanation:

The electronic configuration of Sodium (Na) =

The electronic configuration of Bromine (Br) =

From the above configurations, Sodium ion will loose 1 electron in order to gain stable electronic configuration and that electron is accepted by the Bromine atom because it is 1 electron short of the stable electronic configuration.

(oxidation reaction)

(Reduction reaction)

Bromine atom is reduced to form

Reduction reactions are the reactions in which the element gain electrons.

Oxidation reactions are the reactions in which the element looses its electrons.

Ion formed for bromine = Br-

And it's reduced in that case as it gained an electron

The name and symbols of all the SI units are:

1. Mass: kilogram (kg)
2. Length: meter (m)
3. Volume: cubic meter (m^3)
4. Temperature: kelvin (K).

What are SI units?

The International System of Units also called to as the SI system or simply the SI is the most frequently used system of measurement in the world today. It is abbreviated SI in all languages. There are three types of measurement systems, the international, British, and US customary systems.

The SI unit of mass is kilogram and grams. The length is measured in meters and kilometers. The volume can be measured in cubic meters. Temperature is measured in kelvin and Celsius.

Thus, the symbols and name:

1. Mass: kilogram (kg)
2. Length: meter (m)
3. Volume: cubic meter (m^3)
4. Temperature: kelvin (K).

To learn more about SI units, refer to the link:

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Thank you for posting your question here at brainly. Below is the answer:

At 25 C and 1 atm pressure (the standard state): P is a solid, O2 is a gas, and Cl2 is a gas.

P(s) + O2(g) + Cl2(g) ==> POCl3(l)

To make 1 mole of POCl3, we need to start with 1 mole of P, 1/2 mole of O2, and 3/2 mole of Cl2.

P(s) + 1/2O2(g) + 3/2Cl2(g) ==> POCl3(l)

NOTE: Some people write P as P4(s), in which case you would need 1/4 mole P4.

Answer:

Explanation:

First off, it's important to identify the constituent elements of the Compound.

From the compound, we can identify the following elements;

Phosphorus (P), Oxygen (O) and Chlorine (Cl)

So we have;

P + O + Cl --> POCl3

The standard states of elements are the phases that they adopt at a Temperature of 25°C and Pressure of 1 atm.

For POCl3, the standard form of P is P4 (s) while O2 (g) for O and Cl2 (g) for Cl. With this, we now have;

P4 + O2 + Cl2 --> POCl3

Upon balancing, we have;

P4 + 2O2 + 6Cl2 --> 4POCl3

The above equation shows 4 moles of POCl3, since the question stated one mole, we now have;

1/4 P(s) + 1/2 O(g) + 3/2 Cl(g) -----> POCl3 (l)

Total mass = x

It would be: x*32.38/100 = 32

x = 3200/32.38 = 97.56

Atomic mass of (OH)2 = 34

So, remaining mass = 97.56-34 = 63.56

which is approximately equal to mass of copper

So, we can say m is copper here, and formula of the compound would be Cu(OH)2

Answer:

The mass of NaNO3 needed is 41.82 grams

Explanation:

The molarity of a compound is defined as the number of moles of the substance in 1 liter of solution. Then, from this definition and using a rule of three, it is possible to calculate the amount of moles present in 410 ml. Remember that 1 L = 1000 ml, then 410 ml = 0.410 L

If 1.2 moles of NaNO3 are present in 1 L of solution, how many moles are in 0.410 L of solution?

moles of NaNO3=0.492

And the molar mass of the compound can be calculated by adding the atomic mass of each element present in the compound, taking into account the present amount of each:

• Na: 23 g/mol
• N: 14 g/mol
• O: 16 g/mol

mass of the compound NaNO3= 23 g/mol + 14 g/mol + 16*3 g/mol

mass of the compound NaNO3=85 g/mol

Then, a new rule of three can be applied to calculate the mass of NaNO3 sodium nitrate needed: if in 1 mole they represent 85 grams of sodium nitrate, how many moles are in 0.492 moles?

necessary mass of NaNO3=41.82 grams

The mass of NaNO3 needed is 41.82 grams

Answer: Heterogeneous

Explanation: Element is a pure substance which is composed of atoms of similar elements. Example:

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.Example:

Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material and there is a distinct boundary. Example: Sand in water

Homogeneous mixtures are those in which components are evenly distributed throughout the material and thus there is no distinct boundary.Example: Milk in water

GROUNDWATER is the term used for water that soak into the ground, fills the openings in the soil and trickles into cracks and spaces in rock layers.

Groundwater is usually found underneath the earth surface in the spaces and cracks in sand, rock and soil. It is stored in aquifers. Ground water usually connect with various water bodies such as oceans, rivers and streams and it is always a natural source of water for vegetation. Ground water is a very important natural resource.

The half-life of the radioactive isotope is 1.5 years.

The given parameters;

• Original mass of the sample, N₀ = 500 g
• Remaining mass of the sample, N = 125 g
• Time of decay, t = 3 years

The half-life of the radioactive isotope is calculated as;

Thus, the half-life of the radioactive isotope is 1.5 years.

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