Which group of elements is the most unreactive? Why?

Answers

Answer 1
Answer: Noble Gases because the valence electron shell, or orbital, is complete. They are "happy" with their electrons and don't need to react with others to change. 
Answer 2
Answer: Noble gasses. The already have 8 electrons in their outermost shell

Related Questions

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_____________________are the cules that the continents seem to fit together like pieces of a puzzles.

Answers

Continental Drift are the clues that the Continent seem to fit together like of a puzzle.
The Continental Drift are the cules that the continents seem to fit together like pieces of a puzzles. Abraham Ortelius discovered the Continental Drift in 1596.

Is neon element a metal nonmetal or metalloid

Answers

Neon is considered a "nonmetal inert gas".
Neon has the formula "Ne". It has atomic number of 10, which means it has 10 electrons configured as follows: 1s2, 2s2, 2p6. Based on this, neon is monoatomic and stable in standard form.
Neon is a colorless gas that exhibits an orange-red glow when placed in an electric field.

After decaying for 48 hours,1/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?

Answers

Half-life is the period in which radioisotope sample halves it's mass.
If 1/16 of the sample remains it means that there were 4 half-life periods (16=2⁴)
4 half-life periods = 48 hours      /4
half-life period = 12 hours

Hope it helped :)

The radioisotope is an unstable chemical element. The half-life of the radioisotope after decaying for 48 hours is 12 hours.

What is half-life?

Half-life is a period taken by the radioisotope to get decayed by half the original amount. The half-life is the time that is needed by the reactant to get decreased and form the product.

If the sample remained is 1/16 then there are 4 half-life periods present.

4 half life = 48 hours ÷ 4

= 12 hours

Therefore, 12 hours is the half-life period.

Learn more about half-life here:

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Steps of scientific inquiry?

Answers

1. Figure out a problem
2. Research
3. Hypothesis  
4. Experiment
5. Analyze results 
6. Conclusion 
7. Communicate your results

Hope This Helps. :D 
Ask a question related with your topic
Research data of the topic
Construct logical Hypothesis 
Test your Hypothesis to prove if your hypothesis was correct
Analyze your data and draw a Conclusion
6 Communicate your results to the science community

In this reaction, how many grams of O2 are required to completely react with 110 grams of Al

Answers

You'd need
33.6 g
of aluminium to react with that much manganese dioxide.
So, you've got your balanced chemical equation for this reaction
3
M
n
O
2
(
s
)
+
4
A
l
(
s
)

3
M
n
(
s
)
+
2
A
l
2
O
3
(
s
)

The mole ratio that exists between manganese dioxide and aluminium is simply the ration between the stoichiometric coefficients placed in front of them.
In your case, the balanced chemical equation shows that you have 3 moles of manganese dioxide reacting with 4 moles of aluminium; this means that your mole ratio will be
3:4
.
Likewise, the mole ratio between aluminium and manganese dioxide will be
4:3


4 moles of the former need 3 moles of the latter.
You can put this mole ratio to good use by determining how many moles of aluminium are needed to react with the number of moles of manganese dioxide present in 81.2 g. So,
81.2 g MnO
2

1 mole
86.94 g
=
0.9340 moles

M
n
O
2

This means that you'll need
0.934 moles
M
n
O
2

4 moles Al
3 moles
M
n
O
2
=
1.245 moles Al
To determine the number of grams needed to get that many moles use aluminium's molar mass
1.245 moles Al

26.98 g
1 mole Al
=
33.59 g Al

Rounded to three sig figs, the answer will be
m
aluminium
=
33.6 g

If a substance has a large mass and a small volume what can you conclude about it

Answers

I could conclude, based on that information, that the density of the substance is quite high.
You can conclude that the substance has a very high density!