3 years ago

What does the period number indicate on periodic table

2 answers:

Ber [7]3 years ago

6 0

The period number indicates what electron shell level is being filled. For example, Magnesium is the second element in the third period, which means that there are two electrons in the third shell, assuming that it is neutral.

anastassius [24]3 years ago

4 0

It’s atomic mass is what the number means.

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HELP! HELP!<br> an element with 5 protons, and 8 electrons has an atomic number of?

LenKa [72]

Answer:

Explanation: 15

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3 years ago

calculate the speed of an electron if its de broglie wavelength is twice its displacement in one second

valkas [14]

Answer:

The speed of an electron is 0.01908 m/s.

Explanation:

De-Broglie wavelength is given by:

$\lambda=\frac{h}{mv}$

where, $\lambda$ = wavelength of a particle

h = Planck's constant = $6.626\times 10^{-34}Js$

m = mass of particle

v = velocity of the particle

Velocity of an electron = v

Mass of an electron = $9.1\times 10^{-31}kg$

Wavelength of electron is twice the displacement in seconds which is velocity of an electron.

Then.wavelength of an electron = $\lambda =2v$

$\lambda =2v=\frac{6.626\times 10^{-34}Js}{9.1\times 10^{-31}kg\times v}$

v = 0.01908 m/s

The speed of an electron is 0.01908 m/s.

5 0

3 years ago

The process of change in a population over time is called what?

guapka [62]

Answer:

Microevolution

8 0

3 years ago

= 25 X 5 = (use the correct number of sig figs)

Anton [14]

Answer:

1.25 *10^2

Explanation:

25*5 = 125

= 1.25 *10^2

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3 years ago

What effect does a catalyst have on a reaccion rate an the products formed in a reaccion

elena-s [515]

A catalyst will speed up the activation energy and therefore speed up the reaction. The products will form fast because of this.

8 0

2 years ago