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Aleks04 [339]
3 years ago
13

From top to bottom in most groups of elements, atomic radii tend to A. decrease because the nuclear charge increases. B. decreas

e because electrons are lost to other elements. C. increase because electrons are gained from other atoms. D. increase because additional energy levels are filled.
Chemistry
2 answers:
Taya2010 [7]3 years ago
6 0

<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

Atomic radius is defined as the total distance from the nucleus to outermost orbital of the electron.

As moving from top to bottom, new shell is added around the nucleus. The outermost orbital gets far away from the nucleus and hence, the distance between the nucleus and outermost orbital gets increased.

Thus, the atomic radii of the elements increases as we move from top to bottom in a group.

Hence, the correct answer is Option D.

Stels [109]3 years ago
4 0
D. As more electrons are added to an element, the number of electron orbitals being filled increases
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How many moles are in 7.1x10^21 atoms of iron?
Nitella [24]

Answer:

0.011 moles

Explanation:

There are about 6.02*10^23 atoms in a mole, so in the given sample, there are

\frac{7.01 \times  {10}^{21} }{6.02 \times  {10}^{23} }

which is about 0.011 moles.

8 0
2 years ago
I need to know the independent variable and the dependent variable and control variable
Simora [160]

Independent Variable: a variable that you can change in an experiment

Dependent Variable: something that changes as you change the independent variable

control variable: something that is not changed throughout the experiment

4 0
3 years ago
Which one of the following items does NOT characterize a reducing agent? a. A reducing agent loses electrons. b. A reducing agen
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Answer: D

Explanation:

A reducing agent is a species that reduces other compounds, and is thereby oxidized. The whole compound becomes the reducing agent. In other words, of a compound is oxidized, then they are the reducing agent. On the other hand, if the compound is reduced, it is an ozidizing agent.

Since we have established that a reducing agent is the compound being oxidized, we know that A is not our answer. An oxidized compound is losing electrons. Choice A states exactly this.

For B, this is true as we have established this already.

C is also correct. Since a reducing agent loses electrons, it becomes more positive. This makes the oxidation number increase.

D would be our correct answer. It is actually a good oxidizing agent is a metal in a high oxidation state, such as Mn⁷⁺.

4 0
2 years ago
When 4.50 L of hydrogen gas react with an excess of nitrogen gas at standard temperature and pressure, how many liters of ammoni
VARVARA [1.3K]

Answer:

           3.0 L of NH₃

Solution:

The equation is as follow,

                                    N₂  +  3 H₂     →       2 NH₃

According to equation,

          67.2 L (3 mole) H₂ at STP produces  =  44.8 L (3 mole) of NH₃

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                            4.50 L of H₂ will produce  =  X L of NH₃

Solving for X,

                     X  =  (4.50 L × 44.8 L) ÷ 67.2 L

                     X  =  3.0 L of NH₃

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3 years ago
Microwaves are one type of ________.
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