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sukhopar [10]
2 years ago
7

Why is oxygen an element ? a it is essential to life b it burn c it combines with hydrogen d it cannot be broken down into a sim

ple substance through chemical means
Chemistry
2 answers:
MrRa [10]2 years ago
5 0
D.) It cannot be broken down into a simple substance through chemical means...
lesya [120]2 years ago
4 0

Answer:

D, oxygen cannot be broken down into a simple substance through chemical means,

Explanation:

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Help with Chemistry Thank You To Who Ever Helps Things Have Been Hard For Me.
bija089 [108]

Answer:

1.The electonic configuration of elements and their position in the periodic table are related to each other, From the electronic configuration of the elements, we can determine the period and the group to which the element belongs

Let's consider, sodium with atomic number 11 and k, l, and M shells have 2,8,and 1 electrons. since, there are 3 principal energy levels so we concluded sodium belongs to third period M Shell(valance shell) has only 1 electrons. so sodium belongs to group 1.

2. Entire D-block elements are known as Transition Elements.

3. Group 17 is the halogen group.

4. Main group of elements are...... 1,2, and 13 through 18.

5. Group 18 are the noble gas elements .

12. a). Smaller

b). Increases

c). More reactive

d). Softer

7. a). k › Ca › Ge › Br › Kr

b). Ra › Ba › Sr › Ca › Mg › Be

9. a). Ca(calcium) ion is smaller.

b). Cl(chlorine) atom is smaller.

c). Mg(magnesium) atom is smaller.

10. a). F(fluorine)

b). Sr(strontium)

c). Pb(lead)

d). At(Astatine)

7 0
2 years ago
What is the major role of the nuclear regulatory commission
garik1379 [7]
Monitoring and regulating nuclear waste generated and issues associated to it the US.
5 0
2 years ago
3. How do plants benefit from human respiration?
klasskru [66]
The answer is C

Why:
A - this is natural
B - water is natural
D - this is also natural
C- this is right because when we breathe out we produce more carbon dioxide then we breathed in.
8 0
3 years ago
Read 2 more answers
Plz help. I just need someone to check answer. :(
My name is Ann [436]
These substances can be separated by distillation, so your answer is A.
5 0
3 years ago
Which of the following is a chemical change?
Scorpion4ik [409]
Answer: D, splitting water into hydrogen and oxygen is a chemical change.
8 0
1 year ago
Read 2 more answers
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