Sea, sand, sky, palms – made almost all of

In the early 1900's, Paul Drüde came up with the "sea of electrons" metallic bonding theory by modeling metals as a mixture of atomic cores (atomic cores = positive nuclei + inner shell of electrons) and valence electrons. Metallic bonds occur among metal atoms. Whereas ionic bonds join metals to non-metals, metallic bonding joins a bulk of metal atoms. A sheet of aluminum foil and a copper wire are both places where you can see metallic bonding in action.

Metals tend to have high melting points and boiling points suggesting strong bonds between the atoms. Even a soft metal like sodium (melting point 97.8°C) melts at a considerably higher temperature than the element (neon) which precedes it in the Periodic Table. Sodium has the electronic structure 1s22s22p63s1. When sodium atoms come together, the electron in the 3s atomic orbital of one sodium atom shares space with the corresponding electron on a neighboring atom to form a molecular orbital - in much the same sort of way that a covalent bond is formed.

The difference, however, is that each sodium atom is being touched by eight other sodium atoms - and the sharing occurs between the central atom and the 3s orbitals on all of the eight other atoms. Each of these eight is in turn being touched by eight sodium atoms, which in turn are touched by eight atoms - and so on and so on, until you have taken in all the atoms in that lump of sodium. All of the 3s orbitals on all of the atoms overlap to give a vast number of molecular orbitals that extend over the whole piece of metal. There have to be huge numbers of molecular orbitals, of course, because any orbital can only hold two electrons.

The electrons can move freely within these molecular orbitals, and so each electron becomes detached from its parent atom. The electrons are said to be delocalized. The metal is held together by the strong forces of attraction between the positive nuclei and the delocalized electrons Hope this helped

Answer:

Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure. Pure substances are further classified as elements and compounds. An element is a substance that consists of only one type or kind of atom

Answer:

define the term pure substance​ :

A pure substance does not have to be of a single element or compound, This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties

Explanation:

Answer:

I think it would be D

Explanation:

Answer:

C

Explanation:

 i hope i helped you and have a nice day...

a.bond energy

c. endothermic reaction

d. exothermic reaction

f.exothermic

g.endothermic

Explanation:

1 it easily won't break down using any chemical

2 it is difficult to extract it using chemical process

mark me please

Answer:

2.14 x 10^-10 M

Explanation:

[H+] = 10^(-pH) = 10^-9.67 = 2.14 x 10^-10 M

I believe the control group is what doesn't change in the experiment, and the experimental group is what is being tested / receives the treatment :)

Explanation:

The tidal forces of the Moon are much stronger than the Sun's because it is so much closer to our planet, causing a much greater variation in the gravitational force from one location to another. The Sun's gravitational force, on the other hand, varies much less because the Sun is so far.

Answer:

5.77 s

Explanation:

From the question,

The total time travelled by the projectile = Time of flight (T)

T = 2usinθ/g............ Equation 1

Where T = Time of Flight of the projectile, u = Initial velocity, θ = Angle of projection to the horizontal, g = acceleration due to gravity

Given: u = 40 m/s, θ = 45°

Constant: g = 9.8 m/s²

Substitute these values into equation 1

T = 2(40)sin(45°)/9.8

T = 80sin(45°)/9.8

T = 80×0.7071/9.8

T = 5.77 s

Answer:

UF6

Explanation:

Answer:

speed = 142.8571 miles per hour OR 142.8571 mi/h

Explanation:

speed= [tex]\frac{distance}{time}[/tex]

distance = 500,    time = 3.5hours or 210 minutes

speed= [tex]\frac{500}{210}[/tex]  = 142.8571

hope this helps!!!!

Answer:

The process or result of oxidizing or being oxidized.(Rust)

Explanation:

Pluto

Answer:

1.133mol Al(OH)3

Explanation:

88.4/78.003 = 1.133

Answer:

Acids and bases aqueous solutions will conduct electricity because they contain dissolved ions. Therefore acids and bases are electrolytes. strong acids and bases will be electrolytes. weak acids and bases will be weak electrolytes.

Answer:

tin (IV) oxide octahydrate contains 8 part water

What is the percent composition of water found in tin (IV) oxide octahydrate?

blood is made up of red and white blood cells, platelets and plasma

Answer:

A)

Explanation:

All stars produce some type of energy and radiation. But stars vary in temperature, size, color, and the length of energy they produce.

Answer:

[tex]P_2=1971.2torr[/tex]

Explanation:

Hello there!

In this case, by recalling the Gay-Lussac's gas law, as a directly proportional relationship between pressure and temperature, we can write:

[tex]\frac{P_2}{T_2} =\frac{P_1}{T_1}[/tex]

Thus, by solving for the required final pressure, in atmospheres first, we solve for P2 as follows:

[tex]P_2 =\frac{P_1T_2}{T_1}\\\\P_2=\frac{2.25atm*317K}{275K}\\\\P_2=2.59atm[/tex]

Which in Torricelli is:

[tex]P_2=2.59atm *\frac{760torr}{1atm}\\\\P_2=1971.2torr[/tex]

Best regards!

Answer:

1 : 2 ratio

Explanation:

Chlorine has a coefficient of 1, and sodium chloride has a coefficient of 2.

Answer: thermal  energy a}

Explanation:

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.

the north pole of the magnet will repel the north pole of another magnet

Answer:

0.3171 moles

Explanation:

The computation of the number of moles of gas in the drum is shown below;

The ideal gas equation is

PV = nRT

where

P denotes the pressure of the gas

V denotes the volume of the container

n denotes the number of moles of gas

R denotes the Gas constant

T denotes the temperature

Also P proportionate to n

Now the following formula should be used

P_1 ÷ P_2 = n_1 ÷ n_2

742 ÷ 759 = 0.31 ÷  n_2

n_2 = 759 × 0.31 ÷742

= 0.3171 moles

Answer: 1080

Explanation:

you have to subtract 40 from 13 frist then multiply the remins of the temeture with 40 and your answer is 1080

Answer:

1.T

2.T

3.T

4.F

5.F

6.T

7.T

8.F

9.T

10.T

11.F

12.S

13.T

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A) Be

B) Ca

C) Na

D) Ar

E) Cl

F)  Li

This question simply deals with ionization energy trends across the periodic table or down the group.

Ionization energy is the energy that is needed to remove an electron from its orbital around an atom in such a manner that it will no longer be associated with that same atom.

Now, from studies, it has been found that Ionization energy decreases down a group but it tends to increase as we go from the left to right going across the periodic table.

A) Li(Lithium) and Be(Berrylium) belong to the same period which is period 2 on the periodic table. Berrylium comes after berrylium in that period and as such from the rule earlier, berrylium will have the greater ionization energy.

B) Ca(Calcium) and Ba(Barium) belong to the same group 2 in the periodic table with barium further down the group. Thus, from the trend, Ca(Calcium) will have the greater ionization energy.

C) Na(Sodium) and K(Potassium) belong to the same group 1 in the periodic table with potassium further down the group. Thus, from the trend, Na(Sodium) will have the greater ionization energy.

D) P(Phosphorus) and Ar(Argon) belong to the same period which is period 3 on the periodic table. Argon comes after Phosphorus in that period and as such from the rule earlier, argon will have the greater ionization energy.

E) Cl(Chlorine) and Si(Silicon) belong to the same period which is period 3 on the periodic table. Cl(Chlorine) comes after Si(Silicon) in that period and as such from the rule earlier, Cl(Chlorine) will have the greater ionization energy.

F) Li(Lithium) and K(Potassium) belong to the same group 1 in the periodic table with potassium further down the group. Thus, from the trend,  Li(Lithium) will have the greater ionization energy.

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