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Why there is a dip in electronegativity for the elements Mn and Zn?

dmitriy555 [2]

Among the transition metal elements, Manganese and Zinc have a slight lowering of electronegativities. The reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. Both Manganese and Zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. Although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. Hence, the electronegativity (or the ability to attract electrons) is lessened.

7 0

3 years ago

Human population growth in 2018 was 1.07% . If this rate of growth remains constant, in what year will the human population doub

telo118 [61]

Answer:

Double time = 65.42 years

Explanation:

We can find what year the human population would double using the rule of 70. This is given as;

Double time = 70 / rate(r)

From the question;

Double time = ?

Rate = 1.07%

Inserting into the equation;

Double time = 70 / 1.07

Double time = 65.42 years

8 0

3 years ago

What does it mean when we say "kinetic energy in an electron"?

Rufina [12.5K]

Temperature is a statistical quantity. The formal definition is T = dU/dS, the change in internal energy with respect to entropy holding volume and particle number constant. A practical definition comes from the fact that the atoms, molecules, or whatever particles in a system have an average kinetic energy.

7 0

3 years ago

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A Cu2+ solution is prepared by dissolving a 0.4749 g piece of copper wire in acid. The solution is then passed through a Walden

Luda [366]

Answer:

Concentration of $Cr_2O_7^{2-}$ = 0.03101 M