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3 years ago

Why isn't the mass of the electron included in the mass of an atom on the periodic table?

2 answers:

6 0

Because the mass of electrons are extremely smaller than protons and neutrons, it has no effect on atomic mass. Therefore, it's not included.

joja [24]3 years ago

5 0

It takes roughly 1,840 electrons to add up to the mass of ONE proton or neutron.

The highest element on the periodic chart is Uranium. It's the element with the most complex atoms ... number 92.

In the nucleus of a Uranium atom are 92 protons, plus 146 neutrons in the most common natural Uranium isotope, for a total atomic weight of 238. A neutral Uranium atom has 92 electrons in a cloud around the nucleus.

It takes roughly 1,840 electrons to add up to the mass of ONE proton or neutron.

So in the most complex atom ... with 92 electrons attached to it ... the combined mass of all of its electrons adds up to about 5% of ONE MORE proton or neutron.

You can see that there's no atom of any element where the electrons add enough mass to be worth considering.

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What is the initial position

labwork [276]

Answer:

Initial position of a body is the position of the body before accelerating or increasing its velocity the position changes and then that position is the final position.

hope it is helpful...

6 0

3 years ago

The speed of surface waves in water decreases as the water becomes shallower. Suppose waves travel across the surface of a lake

Elanso [62]

Answer:

The correct solution is "1.2 m".

Explanation:

The given values are:

Wavelength of waves,

λ = 1.5 m

Speed of waves on surface,

V = 2 m/sec

Speed of waves in water,

V₁ = 1.6 m/sec

As we know,

⇒ $V=f\times \lambda$

or,

⇒ $f=\frac{V}{\lambda}$

On substituting the values, we get

⇒ $=\frac{2}{1.5}$

⇒ $=1.33 \ Hz$

hence,

⇒ $\lambda_1=\frac{V_1}{f}$

On substituting the values, we get

⇒ $=\frac{1.6}{1.33}$

⇒ $=1.2 \ m$

7 0

3 years ago

The scientist most often credited with the idea that matter can have wave-like properties is:

Flura [38]

I believe the correct answer from the choices listed above is option B. The scientist most often credited with the idea that matter can have wave-like properties is de Broglie. He related E=mc^2, E=hf and p=mv in order to acquire the de Broglie wavelength, whose formula λ=h/p where h is Planck's constant and p is momentum of the particle.

6 0

4 years ago

Read 2 more answers

Two football players with mass 75kg and 100kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively, If the

Rina8888 [55]

Answer:

2 m/s

Explanation:

From the law of conservation of momentum,

Total momentum before collision = total momentum after collision

mu+m'u' = V(m+m') .................................Equation 1

Where m = mass of the first player, u = initial speed of the first player, m' = mass of the second player, u' = initial speed of the second player, V = combined speed of both players.

Making V the subject of the equation,

V = (mu+m'u')/(m+m')................ Equation 2

Note: Taking the direction of the first player as positive.

Given: m = 75 kg, m' = 100 kg, u = 6 m/s, u' = -8 m/s (opposite the first player),

Substituting into equation 2

V = [(75×6)+(100×(--8))]/(75+100)

V = (450-800)/175

V = 350/175

V = - 2 m/s.

Note: The negative signs tells that the combined speed is in the direction of the second player.

Hence the combined speed of the two players = 2 m/s

8 0

4 years ago

How long does it take for mars to rotate on its axis

Svetllana [295]

Hello There!

It takes the planet Mars around 24 hours, 37 minutes, 23 seconds to rotate on its axis. This is around the same amount of time that it takes our planet to rotate once on its axis.

8 0

3 years ago

Read 2 more answers