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8_murik_8 [283]
3 years ago
13

What is the noble gas configuration for Cobalt?

Chemistry
1 answer:
Pani-rosa [81]3 years ago
4 0

Answer:

a. [Ar] 4s2 3d7

Explanation:

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Determine the oxidation number of the element "J" in H3JO2-
igor_vitrenko [27]

Answer:

Oxidation number:

3*1+ oxidation number of J+2*-2= -1

Oxidation number of J = 0

5 0
2 years ago
potassium, k, has an atomic number of 19 and an atomic mass of 39 how many electrons does a neutral atom of K have?
coldgirl [10]
A neutral atom of potassium has 19 electrons.
8 0
3 years ago
Oxidation and reduction reactions (redox) involve the loss and gain of electrons. Half-reactions are a way for us to keep track
jok3333 [9.3K]

Answer:

Electrons are lost during oxidation (LEO)

4 0
2 years ago
Explain the most important difference between a physical and chemical change.
timama [110]
You can see a physical change always but not always a chemical
7 0
2 years ago
Read 2 more answers
How many moles are in 25 grams of dihydrogen monoxide
timurjin [86]
If you'd like the full working, here it is:

I calculated this by using the formula triangle.

Mass

Number Formula
Of moles Mass

To calculate the number if moles in a substance, you need to divide the Mass by the Formula mass. You get the formula mass by adding the atomic masses of the elements in the compound together. In this situation, H2O, it would be two hydrogen molecules plus one oxygen molecule which is 2 + 16. This is because the atomic mass of Hydrogen is 1 and the atomic mass of Oxygen is 16.

Now that we have the Formula mass we can go ahead and do the calculation since we already have the Mass. You do as follows:

Mass divided by Formula mass which is in this case - 25 divided by 18

By doing this calculation you will get the answer which is 1.38 moles which can be rounded to 1.4

Hope this helps :)
6 0
3 years ago
Read 2 more answers
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