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
erma4kov [3.2K]
3 years ago
13

What is the 2nd most abundant element in the earths crust

Chemistry
1 answer:
Elza [17]3 years ago
3 0

Silicon is the second most abundant element in the Earth´s crust and makes up around 27% of it.

You might be interested in
1. Water is easily contaminated by both biological and chemical contaminants. Define and give 3 examples of each
tamaranim1 [39]
Are there options like A,B,C,D?

7 0
3 years ago
Select the correct answer.
ivann1987 [24]

Answer:

C.

Explanation:

The electronic configuration of N (7 electrons): 1s² 2s² 2p³.

The orbital 1s is filled with two electrons and their spinning direction is opposite and also electrons of 2s.

3p contains (3 electrons) should fill the 3 orbitals firstly. Every orbital contains 1 electron and be in the same spin direction.

So, the right choice is c.

A is wrong because 2 electrons of 3p are paired in the first orbital before filling every orbital.

B is wrong because the 2 electrons of 1s and 2s are in the same direction and also 2 electrons of 3p are paired in the first orbital before filling every orbital.

D is also wrong the 2 electrons of 1s and 2s are in the same direction and the electron in the second orbital of 3p are in opposite direction of the other 2 electrons.

7 0
3 years ago
What is a compound in chemistry
kykrilka [37]
Two types of chemical bonds common in compounds are covalent bonds and ionic bonds. The elements in any compound are always present in fixed ratios. Example 1: Pure water is a compound made from two elements - hydrogen<span> and </span>oxygen<span>.</span>
5 0
3 years ago
consider an atom having four distinct neergy levels. if an electron is able to make transitions between, any two levels, how man
ludmilkaskok [199]

Answer:

6 different frequencies

Explanation:

From energy level 1 to 2 is one frequency, from energy level 1 to 3 is one frequency and From energy level 1 to 4 is one frequency. So, we have a total of 3 frequencies for transition from energy level 1.

From energy level 2 to 3 is one frequency and from energy level 2 to 4 is one frequency. So, we have a total of 2 frequencies for transition from energy level 2.

From energy level 3 to 4 is one frequency.

So we have a total of 3 + 2 + 1 different frequencies = 6 different frequencies.

Note that the reverse process for each step produces the same frequency as the step in consideration.

8 0
3 years ago
Rusting Out. How Acids Affect the Rate of corrosion
AlekseyPX
Acids change the rate Corrosion and increase its temperature. 
8 0
3 years ago
Other questions:
  • What types of compounds do not dissolve in water?
    13·1 answer
  • Which element is placed in the same period as ruthenium but has a higher atomic number than it? bismuth osmium silver zirconium
    15·2 answers
  • Which of the following correctly describes the size of meteoroids?
    6·2 answers
  • Which statement best describes the movement of Wind?
    13·1 answer
  • The solid has a mass of 180 g. What is the den of the solid?
    6·1 answer
  • How many electrons would the single cation of Rb have? *
    5·1 answer
  • PLEASE HELP ASAP ONE MORE QUESTION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    8·1 answer
  • Why is it important to prepare for disaster? what are the things you need to prepare?​
    10·1 answer
  • The definition of a chemical change is when two or more substances (molecules) combine to form a new substance (or new molecules
    9·2 answers
  • Nancy learned in school that composting is a way to cycle nutrients, and as tiny ecosystems, composting requires biotic and abio
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!