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klasskru [66]
2 years ago
12

By reacting, an element that does not have a complete set of valence electrons can acquire an electron configuration similar to

that of a noble gas.Why is a noble gas different from other elements?
Its highest electron-energy level is filled.

It’s highest electron-energy level has one electron.

It has a single electron-energy level.

Its highest electron-energy level is unoccupied.
Physics
2 answers:
Lunna [17]2 years ago
5 0

Option (A) is correct.

A noble gas is different from other elements because its highest electron energy level is completely filled.The examples of noble gases are helium, neon, Argon , krypton,Xenon , radon.

All the noble gases have completely filled outermost shell. for example, Helium has two electrons and both of them are present in first shell. Neon has 10 electrons, so its electronic configuration is 2,8.It has two electrons in the first shell and eight electrons in the second shell. Thus the outermost shell of both Helium and Neon is completely filled.

This property of having completely filled outermost shells makes noble gases different from the rest of the elements.These noble gases are very less reactive .

Marina CMI [18]2 years ago
3 0

Answer:Its highest electron-energy level is filled.

Explanation:

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A dog of mass 10 kg sits on a skateboard of mass 2 kg that is initially traveling south at 2 m/s. The dog jumps off with a veloc
Tasya [4]

Answer:

17 m/s south

Explanation:

m_1 = Mass of dog = 10 kg

m_2 = Mass of skateboard = 2 kg

v = Combined velocity = 2 m/s

u_1 = Velocity of dog = 1 m/s

u_2 = Velocity of skateboard

In this system the linear momentum is conserved

(m_1+m_2)v+m_1u_1+m_2u_2=0\\\Rightarrow u_2=-\dfrac{(m_1+m_2)v+m_1u_1}{m_2}\\\Rightarrow u_2=-\dfrac{(10+2)2+10\times 1}{2}\\\Rightarrow u_2=-17\ m/s

The velocity of the skateboard will be 17 m/s south as the north is taken as positive

3 0
2 years ago
Sam is conducting an experiment in a closed room. He places two sound-generating instruments, A and B, in different places in th
diamong [38]

Answer: The correct answer is "Instrument A is placed closer to Sam than instrument B".

Explanation:

The sound can be soft or loud. Loudness depends on the amplitude of the sound wave. Higher the amplitude, more will be loudness. Lower the amplitude, lesser will be loudness.

Pitch depends on the frequency.

In the given problem, the instruments A and B generate sound waves of the same amplitude and at the same time.

Loudness depends on the sound energy produced as the energy of the sound is directly proportional to the square of the amplitude. It also depends on the distance between the source and the receiver.

Sam records a louder sound from instrument A than from instrument B. It means that there is mismatch in loudness. It can happen due to the placement of the instrument A closer to Sam than instrument B.

Therefore, the correct option is "Instrument A is placed closer to Sam than instrument B".

4 0
2 years ago
In some amazing situations, people have survived falling large distances when the surface they land on is soft enough. During a
OleMash [197]

Answer:

-3413 ft/s2

Explanation:

We need to know the velocity with which he landed on the snow.

He 'dropped' from 512 feet. This is the displacement. His initial velocity is 0 and the acceleration of gravity is 32 ft/s2.

We use the equation of mition

v^2 = u^2 + 2as

v and u are the initial and final velocities, a is the acceleration and s is the displacement. Putting the appropriate values

v^2 = 0^2 + 2\times32\times512

v = \sqrt{2\times32\times512} = 128\sqrt{2}

This is the final velocity of the fall and becomes the initial velocity as he goes into the snow.

In this second motion, his final velocity is 0 because he stops after a displacement of 4.8 ft. We use the same equation of motion but with different values. This time, u=128\sqrt{2}, v = 0 and s = 4.8 ft.

0^2 = (128\sqrt{2})^2 + 2a\times4.8

a = -\dfrac{2\times128^2}{2\times4.8} = -3413

Note that this is negative because it was a deceleration, that is, his velocity was decreasing.

5 0
2 years ago
A 10 kg ball moving at 13 m/s strikes a 20 kg ball at rest. after the collision the 10 kg ball is moving with a velocity of 7m/s
Lostsunrise [7]

Answer:

30 (kg)

Explanation:

therefore the mass of the ball is 2 so 30 (kg)

6 0
2 years ago
Read 2 more answers
A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16-cm-high steps a 70-kg athlete
erastovalidia [21]

Answer:

407 steps

Explanation:

From the question,

P = mgh/t........... Equation 1

Where P = power, m = mass, g = acceleration due to gravity, h = height, t = time.

Make h the subject of the equation

h = Pt/mg............. Equation 2

Given: P = 746 W, t = 1 minute = 60 seconds, m = 70 kg.

Constant: g = 9.8 m/s²

Substitute into equation 2

h = 746(60)/(70×9.8)

h = 44760/686

h = 65.25 m

h = 6525 cm

number of steps = 6525/16

number of steps = 407 steps

6 0
2 years ago
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