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frez [133]
4 years ago
11

What are the two most abundant elements in the universe

Chemistry
2 answers:
disa [49]4 years ago
5 0
Oxygen and hydrogen....Please mark brainliest...
Yuri [45]4 years ago
4 0
The two most abundant elements in the universe are HYDROGEN AND HELIUM. Hydrogen is the most abundant element followed by helium. 
Hydrogen is the lightest of all element and the first element to be formed, followed by helium which has just two atoms.
You might be interested in
Periodic Properties
Brrunno [24]
Sorry this isnt an answer but this is a lot of work, if you really need it answered make it worth more points :)
4 0
3 years ago
Rank the ions in each set in order of increasing size, and explain your ranking:
Paha777 [63]

Explanation:

Lithium, sodium and potassium are all group 1A elements and when we move down a group then there occurs an increase in atomic size of the elements. As lithium is the smallest and potassium being the largest so, when each of them will lose an electron and obtain a positive charge then size of lithium will further decrease.

Therefore, ions are ranked according to their increase in size as follows.

                      Li^{+} < Na^{+} < K^{+}  

When an atom tends to gain electrons then it acquires a negative charge. This means that size of the atom increases.  

So, more is the negative charge present on an atom more will be its atomic size. Therefore, correct order of increasing size for Se^{2-}, Rb^{+}, Br is as follows.

                      Br < Rb^{+} < Se^{2-}

Similarly, order of increasing size of O^{2-}, F^{-}, N^{3-} is as follows.

                    F^{-} < O^{2-} < N^{3-}

5 0
3 years ago
The reaction between calcium acetate and lithium phosphate forms a white precipitate (the insoluble compound calcium phosphate),
kenny6666 [7]

Hello!


The coefficient for Lithium Acetate in the balanced chemical equation is 6


Why?


This is the reaction:


(CH₃COO)₂Ca(aq) + Li₃PO₄(aq) → Ca₃(PO₄)₂(s) + CH₃COOLi(aq)


For balancing the equation, we're going to apply the Law of Conservation of Mass, which states that matter is not created nor destroyed, and the number of atoms of each element should be the same on both sides of the equation, from that, the balanced equation is:


3(CH₃COO)₂Ca(aq) + 2Li₃PO₄(aq) → Ca₃(PO₄)₂(s) + 6CH₃COOLi(aq)


Have a nice day!

3 0
4 years ago
A container of oxygen with a volume of 150 L is heated from 300 K to 600 K.
slava [35]

Answer:150

Explanation:

3 0
3 years ago
Write a balanced chemical equation for the standard formation reaction of gaseous dinitrogen tetroxide
ElenaW [278]

Answer:

N_2(g)+2O_2(g)\rightarrow N_2O_4(g)

Explanation:

Hello,

In this case, considering the required product which is dinitrogen tetroxide whose molecular formula is N₂O₄, by considering its formation reaction which is starting by both gaseous nitrogen and oxygen as shown below:

N_2(g)+O_2(g)\rightarrow N_2O_4(g)

Nevertheless, it should be balance since four oxygen atoms are present at the right side, thus, we obtain:

N_2(g)+2O_2(g)\rightarrow N_2O_4(g)

Best regards.

4 0
4 years ago
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