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3 years ago

How did Mendeleev organize the elements to create a periodic table

2 answers:

4 0

Mendeleev arranged the elements known at that time according to atomic mass. The elements were arranged in rows called periods, in increasing order. Each row had eight elements. He also arranged them accordingly in columns, where the elements in each column, called groups, had similar properties.

He left some blanks on his table because he predicted that the big gaps between some atomic mass' of elements indicated that there were other elements yet to be discovered that would fill in that gap. He was able to predict the atomic weights of some of the elements in between.

irga5000 [103]3 years ago

4 0

The answer is according to increase mass and similar properties

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How does moon changes position every day?

photoshop1234 [79]

It moves relative to the stars

3 0

4 years ago

describe an experiment to show how the frequency of a note emitted by a vibrating string depends on the tension of the string

mart [117]

Easy !

Take any musical instrument with strings ... a violin, a guitar, etc.

The length of the vibrating part of the strings doesn't change ...
it's the distance from the 'bridge' to the 'nut'.

Pluck any string. Then, slightly twist the tuning peg for that string,
and pluck the string again.

Twisting the peg only changed the string's tension; the length
couldn't change.

-- If you twisted the peg in the direction that made the string slightly
tighter, then your second pluck had a higher pitch than your first one.

-- If you twisted the peg in the direction that made the string slightly
looser, then your second pluck had a lower pitch than the first one.

3 0

3 years ago

Boyle's Law states that when a sample of gas is compressed at a constant temperature, the product of the pressure and the volume

11111nata11111 [884]

I’m stuck on this too

4 0

3 years ago

An electron initially has a speed 16 km/s along the x-direction and enters an electric field of strength 27 mV/m that points in

weqwewe [10]

Answer:

a) $t=1.4\times 10^{-5}\ s$

b)S= 46.4 cm

Explanation:

Given that

Velocity = 16 Km/s

V= 16,000 m/s

E= 27 mV/m

E=0.027 V/m

d= 22.5 cm

d= 0.225 m

lets time taken by electron is t

d = V x t

0.225 = 16,000 t

$t=1.4\times 10^{-5}\ s$

We know that

F = m a = E q ------------1

Mass of electron ,m

$m=9.1\times 10^{-31}\ kg$

Charge on electron

$q=1.6\times 10^{-19}\ C$

So now by putting the values in equation 1

$a=\dfrac{E q}{m}$

$a=\dfrac{1.6\times 10^{-19}\times 0.027}{9.1\times 10^{-31}}\ m/s^2$

$a=4.74\times 10^{9}\ m/s^2$

$S= ut+\dfrac{1}{2}at^2$

Here initial velocity u= 0 m/s

$S= \dfrac{1}{2}\times 4.74\times 10^{9}\times (1.4\times 10^{-5})^2\ m$

S=0.464 m

S= 46.4 cm

S is the deflection of electron.

4 0

4 years ago

Read 2 more answers

You are walking down a straight path in a park and notice there is another person walking some distance ahead of you. The distan

xenn [34]

Answer:

41.07 m

Explanation:

According to the data:

Velocity = 2.65 m/s

Time = 15.5 s

Now the formula to calculate the distance is

Distance = Velocity x Time

Distance = 2.65 x 15.5

Distance = 41.07 meter

Kindly note that the person suddenly started to run at the velocity which is mentioned later that is 2.65 m/s.So the velocity given before is just ignored and we don't have to use any of the three equations of motion of kinematics.

3 0

3 years ago