1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olganol [36]
3 years ago
10

Which element would you expect to be more metallic? (a) Ca or Rb (b) Mg or Ra (c) Br or I

Chemistry
1 answer:
svlad2 [7]3 years ago
7 0

Explanation:

When we move across a period from left to right then there will occur an increase in electronegativity and also there will occur an increase in non-metallic character of the elements.

As calcium (Ca) is a group 2A element and rubidium (Rb) is a group 1A element. Hence, Rb being an alkali metal is more metallic in nature than calcium (alkaline earth metal).

Both magnesium (Mg) and radium (Ra) are group 2A elements. And, when we move down a group then as the size of element increases so, it becomes easy of the metal atom to lose an electron.

As a result, there occurs an increase in metallic character of the element. Hence, Radium (Ra) is more metallic in nature than magnesium (Mg).

Also, both bromine and iodine are group 17 elements. Since, both of them are non-metals and non-metallic character increases on moving down the group.

Therefore, bromine (Br) is more metallic than iodine.

You might be interested in
Tumu’s class was given an assignment to feature a scientist that contributed to the development of the cell theory. The class de
Ad libitum [116K]

Answer: the way root cells reproduce to increase root length

Explanation:

Rudolf Ludwig Carl Virchowas known as the founder of social medicine and also the father of modern pathology.

Virchow posited that all cells are gotten from already existing cells and he used this in his work towards cellular pathology, as it was made clear that diseases takes place at the cellular level. He posited that the cells that are malfunctioning cause diseases.

Based on the above analysis, the image that Tumu would most likely use in his assignment to feature Rudolf Virchow is the way root cells reproduce to increase root length.

4 0
2 years ago
Read 2 more answers
Why argon is octent ??​
Ira Lisetskai [31]

Answer:

argon is octet because it has eight electrons in its valence shell

Explanation:

6 0
3 years ago
Read 2 more answers
Compare the properties of elements in groups 17 and group 18. Make sure to cover the following points:
My name is Ann [436]
The answer for this question is b
7 0
2 years ago
Read 2 more answers
Consider an exceptionally weak acid, HA, with a Ka = 1x10 -20 . You make a 0.1M solution of the salt Na
Vedmedyk [2.9K]

Answer:

pH=13

Explanation:

Hello,

In this case, given the acid, we can suppose a simple dissociation as:

HA\rightleftharpoons H^+ + A^-

Which occurs in aqueous phase, therefore, the law of mass action is written by:

Ka=\frac{[H^+][A^-]}{[HA]}

That in terms of the change x due to the reaction's extent we can write:

1x10^{-20}=\frac{x*x}{0.1M-x}

But we prefer to compute the Kb due to its exceptional weakness:

Kb=\frac{Kw}{Ka}=\frac{1x10^{-14}}{1x10^{-20}}  =1x10^{-6}

Next, the acid dissociation in the presence of the base we have:

Kb=\frac{[OH^-][HA]}{[A^-]}=1x10^{6}=\frac{x*x}{0.1-x}

Whose solution is x=0.0999M which equals the concentration of hydroxyl in the solution, thus we compute the pOH:

pOH=-log([OH^-])=-log(0.0999)=1

Finally, since the maximum scale is 14, we can compute the pH by knowing the pOH:

pH+pOH=14\\\\pH=14-pOH=14-1\\\\pH=13

Regards.

5 0
3 years ago
Read 2 more answers
Sulfuric acid dissolves in water as H2SO4 2 H+(aq) + SO2 -2(aq). Which of the following solutions of H2SO4 will conduct the most
AlexFokin [52]
I believe it's 2.0 m
6 0
3 years ago
Read 2 more answers
Other questions:
  • Should carbon dioxide be considered to be a pullutant
    12·1 answer
  • Which element has the highest electronegativity?
    7·2 answers
  • if 31.2 grams of tin (IV) carbonate are actually formed when this reaction goes to completion, what is the percent yield?
    15·1 answer
  • 65 ml of a 1.3 m solution is dilluted to a total volume of 208 ml. a 104 ml portion of that solution is dilluted by adding 109 m
    11·1 answer
  • What did Robert Millikan discover?
    8·1 answer
  • Why has Earth's climate changed so rapidly in recent years?
    7·1 answer
  • You are throwing an object with a force of 140 N. The object accelerates 19.0 m/s/s. What is the mass of the object?
    7·1 answer
  • Arturo says that some plastics are made by chemically joining the same molecule to itself. Ida says that some plastics are made
    9·2 answers
  • What statement correctly describes gravity
    11·2 answers
  • Which of the following types of radiation can be blocked with only a sheet of paper?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!