Quis critérios foram usadps por dobereiner em sua tentava de organiza os elementos químicos?

Chemistry

1 answer:

anyanavicka [17]2 years ago

8 0

Döbereiner grouped the known elements into triads (sets of three) so that

• The atomic mass of the middle element was approximately the average of the other two

• The chemical properties of the middle element were between those of the other two

• The physical properties of the middle element were between those of the other two

One example of a triad is Li – Na – K.

(a) Atomic mass of Na = 23.0 u

Average atomic mass of Li and K = (6.9 u + 39.1 u)/2 = 46.0 u/2 = 23.0 u

(b) Li reacts slowly with water. Na reacts rapidly. Potassium reacts violently.

Average melting point of Li and K = (454 °C + 330 °C)/2 = 784 °C/2

= 392 °C

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Bond length is the distance between the centers of two bonded atoms. on the potential energy curve, the bond length is the inter

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Answer:Hence, the bond length in HCl is 125 pm.

Explanation:

Bond length : It is an average distance between the nuclei of two bonded atoms in a molecule.

Also given that bond length is the distance between the centers of two bonded atoms. on the potential energy curve, the bond length is the inter-nuclear distance between the two atoms when the potential energy of the system reaches its lowest value. Beyond this if atoms come closer to each other then their will be repulsion between them.

So, the bond length between the Hydrogen and Chlorine atom in HCl molecule is :

$Bond length=radius _{hydrogen}+radius_{chlorine}=25pm+100pm=125pm$