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AlladinOne [14]
2 years ago
12

8. Consider the element Scandium, atomic # 21.

Chemistry
1 answer:
yawa3891 [41]2 years ago
4 0

Explanation:

Scandium has atomic number of 21. This means that in it's neutral state its going to have 21 electrons.

a) The full electronic configuration is given as;

1s2 2s2 2p6 3s2 3p6 3d1 4s2

The final electron is placed in the d orbital. The shell is 3d

(b) When scandium has a charge if +1, it has lost an electron. The total number of electrons would now be 21-1 = 20

The electronic configuration would be given as;

1s2 2s2 2p6 3s2 3p6 4s2

The electron in the 3d orbital would be removed.

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The radioactive atom 61/27 co emits a beta particle. write an equation showing the decay
pickupchik [31]

Answer:

\rm _{27}^{60}\text{Co} \longrightarrow \,  _{-1}^{0}\text{e} + \, _{28}^{60}\text{Ni}

Explanation:

The unbalanced nuclear equation is

\rm _{27}^{60}\text{Co} \longrightarrow \,  _{-1}^{0}\text{e} + \, ?

Let's write the question mark as a nuclear symbol.

\rm _{27}^{60}\text{Co} \longrightarrow \,  _{-1}^{0}\text{e} + \,  _{Z}^{A}\text{X}

The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.  

Then

60 = 0 + A, so A = 60 - 0 = 60, and

27 = -1 + Z, so Z  = 27 + 1 = 28

Your nuclear equation becomes

\rm _{27}^{60}\text{Co} \longrightarrow \,  _{-1}^{0}\text{e} + \, _{28}^{60}\text{X}

Element 28 is nickel, so the balanced nuclear equation is

\rm _{27}^{60}\text{Co} \longrightarrow \,  _{-1}^{0}\text{e} + \, _{28}^{60}\text{Ni}

7 0
2 years ago
The average amount of energy of motion of each particle of a substance is called what?
kobusy [5.1K]
Temperature is the average amount of energy of motion of each particle of a substance<span>. That is, temperature is a measure of how hot or cold a </span>substance<span> is. In contrast, the total </span>energy of motion<span> in the </span>particles of a substance is called<span> thermal</span>energy<span>.</span>
4 0
3 years ago
A student repeats a reaction several times to test the effects of various
motikmotik
Decreasing the concentration would decrease the reaction rate (option c)

The aforementioned statement is due to the fact that when a substance's concentration is high, it will quickly perform the chemical reaction as there are more particles reacting with one another. Conversely, if there is less of a concentration, then the reaction rate would decrease as there are little particles reacting with one another.
7 0
2 years ago
Read 2 more answers
Please hurry!!!!!
maksim [4K]
Light. ever heard of moon cycles? so d and c are out of the question. and although almost non-existent, the moon does have gravity. only thing the moon doesn't have is light emitting from itself
6 0
2 years ago
PLEASE ANSWER
Makovka662 [10]

Answer:

Answer is D

Explanation:

xrays would be far more efficient at detecting objects through solids.

8 0
3 years ago
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