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3 years ago

Which two elements have the same number of valence electrons?

Physics

2 answers:

Kazeer [188]3 years ago

5 0

Carbon and silicon both have 4 valence electrons

docker41 [41]3 years ago

3 0

we know that

In the periodic table, each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons.

see the attached figure

therefore

the answer is

Silicon and Carbon have the same number of valence

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A helicopter is hovering above the ground. Jim reaches out of the copter (with a safety harness on) at 180 m above the ground. A

vesna_86 [32]

Answer:

The maximum height of the package is 140 m above the ground. Jim Bond will not catch the package.

Explanation:

Hi there!

The equation of height and velocity of the package are the following:

h = h0 + v0 · t + 1/2 · g · t²

v = v0 + g · t

Where:

h = height of the package at time t.

h0 = initial height.

v0 = initial velocity.

t = time.

g = acceleration due to gravity (-9.81 m/s² because we consider the upward direction as positive).

v = velocity of the package at a time t.

First, let´s find the time it takes the package to reach the maximum height. For this, we will use the equation of velocity because we know that at the maximum height, the velocity of the package is zero. So, we have to find the time at which v = 0:

v = v0 + g · t

0 = 50.5 m/s - 9.8 m/s² · t

Solving for t:

-50.5 m/s / -9.81 m/s² = t

t = 5.15 s

Now, let´s find the height that the package reaches in that time using the equation of height. Let´s place the origin of the frame of reference on the ground so that the initial position of the package is 10 m above the ground:

h = h0 + v0 · t + 1/2 · g · t²

h = 10 m + 50.5 m/s · 5.15 s - 1/2 · 9.81 m/s² · (5.15 s)²

h = 140 m

The maximum height of the package is 140 m above the ground. Jim Bond will not catch the package.

6 0

3 years ago

¿Cómo la publicidad contribuye a la anemia en la etapa de nuestro desarrollo humano?.

Valentin [98]

Answer:

it helps get jobs i guess

Explanation:

4 0

3 years ago

We sing better in the shower due to standing waves. Assume that your shower is 2.45 m (about 8 ft) tall and can be modeled as an

Ivahew [28]

Answer:

λ = 4.9 m

Explanation:

given,

length of the organ pipe,L = 2.45 m

wavelength of the standing wave = ?

fundamental harmonic is given as,

$L= \dfrac{\lambda}{2}$

$\lambda= 2 \times L$

$\lambda= 2 \times 2.45$

λ = 4.9 m

Hence, the wavelength of the fundamental harmonic for standing waves in this shower is given by λ = 4.9 m

4 0

4 years ago

Read 2 more answers

I need help with science

Nataly [62]

Answer:

Ca = 2

Cl = 2

O = 6

Explanation:

Element given from the question above include = 2CaClO₃

NOTE: The 2 in front of CaClO₃ is affecting Ca, Cl and O.

Thus, the number of each atom of element present in 2CaClO₃ can be obtained as follow:

Ca = 1 × 2 = 2

Cl = 1 × 2 = 2

O = 3 × 2 = 6

Thus,

Ca = 2

Cl = 2

O = 6

5 0

3 years ago

What's the speed of sound?

denis23 [38]

That depends on what the sound is traveling through, and the density
and temperature of the substance.

In dry air, at sea-level pressure and 68° F, the speed of sound is
about 340 meters per second (761 miles per hour).

7 0

3 years ago