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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 train traveling at 27.5 m/s accelerates to 42.4 m/s over 75.0 s. What is the displacement of the train in this time period

Sergio [31]

Answer:

2621.25 meters

Explanation:

First, write down what we are given.

Initial velocity = 27.5 m/s

Final velocity = 42.4 m/s

Time = 75 seconds

We need to look at the kinematic equations and determine which one will be best. In this case, we need an equation with distance. I am going to use $v_{f}^{2} = v_{i}^{2} +2ad$ , but you can also use the other equation, $x = v_{o}t+\frac{1}{2}at^{2}$

We need to find acceleration. To find it, we need to use the formula for acceleration: $a = \frac{v_{f}-v_{i}}{t}$ . Plugging in values, $a = \frac{42.4-27.5}{75} = .199\ m/s^{2}$

Next, plug in what we know into the kinematics equation and solve for distance. $42.4^{2} = 27.5^{2} + 2(.199)(d)\\d = 2621.25\ meters$

7 0

3 years ago

A person walks in the following pattern: 3.1 km north, then 2.4 km west, and finally 5.2 km south. a) Sketch the vector diagram

zysi [14]

Answer:

$d = 3.19 km$

direction is given as

$\theta = 41.2 degree$ South of West

Explanation:

Part b)

displacement is given as

$d_1 = 3.1 \hat j$

$d_2 = 2.4 \hat i$

$d_3 = 5.2(-\hat j)$

now we will have

$d = d_1 + d_2 + d_3$

$d = 2.4 \hat i + (3.1 - 5.2)\hat j$

$d = 2.4 \hat i - 2.1 \hat j$

total displacement is given as

$d = \sqrt{2.4^2 + 2.1^2}$

$d = 3.19 km$

direction is given as

$tan\theta = \frac{-2.1}{2.4}$

$\theta = 41.2 degree$ South of West

3 0

4 years ago

2. Which of the following is a true statement.

lorasvet [3.4K]

Answer:

Sound travels slower than light

Explanation:

Sound travels at around 1/3 km per second, while light travels around 300,000 km per second.

Also, this is the reason you see the lightning before you hear the thunder.

I hope this helped.

5 0

3 years ago

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Average wavelength of radio waves

Nesterboy [21]

Answer:

Radio waves have frequencies as high as 300 gigahertz(GHz)to as low as 30 hertz(Hz).At 300 GHz the corresponding wavelength is 1mm and at 30Hz is 10,000 km

7 0

3 years ago

When gametes combine to form a zygote, the chromosomes number of the zygote is now referred to as

Serga [27]

the answer to the complicated question is a diploid

6 0

4 years ago

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