Which two elements have the same number of energy levels with electrons in them?(1 point)

Which of these is not a postulate of the kinetic-molecular theory of gases?

marin [14]

a) Gas particles have most of their mass concentrated in the nucleus of the atom.

b) The moving particles undergo perfectly elastic collisions with the walls of the container.

c) The forces of attraction and repulsion between the particles are insignificant.

d) The average kinetic energy of the particles is directly proportional to the absolute temperature.

e) All of the above are postulates of the kinetic molecular theory.

Gas particles have most of their mass concentrated in the nucleus of the atom.

Answer: Option A.

Explanation:

Kinetic Molecular Theory expresses that gas particles are in consistent movement and show flawlessly versatile crashes. Motor Molecular Theory can be utilized to clarify both Charles' and Boyle's Laws. The normal active vitality of an assortment of gas particles is straightforwardly corresponding to total temperature as it were.

The kinetic theory of gases is a significantly critical, however straightforward model of the thermodynamic conduct of gases with which numerous important ideas of thermodynamics were built up.

6 0

3 years ago

What is the aim of golden rain demonstration

Andrei [34K]

demonstrates the formation of a solid precipitate

3 0

3 years ago

If a sample has a mass of 245.8 grams and takes up 94ml of space, what is the density of the sample?

allochka39001 [22]

To find the density of any sample, you need to know the Mass (grams), and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get a sample's Density.

Density (P)= Mass(m)/Volume(V)

P=m/V

P=245.8grams/94ml

P=2.65grams per ml

7 0

3 years ago

Name two elements that have properties similar to those of beryllium and have average atomic masses higher than 130

sertanlavr [38]

In the periodic table, elements of the same group are characterized by having the same similar properties.
So, first we will check the elements that lie within the same group as beryllium and then we will attempt to choose the elements with atomic mass higher than 130.

So, elements in the same group as beryllium are: magnesium, calcium, strontium, barium and radium.
Among these elements, we will find that:
radium has atomic mass of 226 amu
barium has atomic mass of 137.327 amu

Based on this, the two elements would be barium and radium.

3 0

3 years ago

EASY 8TH GRADE SCIENCE

mixer [17]

Generally chemists measure substance in moles because it is very difficult to count the number of molecules

6 0

3 years ago

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