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rewona [7]
3 years ago
6

The electronic arrangement of an atom shows how electrons are distributed across the different energy levels. Which of the follo

wing elements is represented by the electron arrangement 2, 8, 18, 6?
А Сa
B. Mg
C. S
D Se
E. Ga
Chemistry
1 answer:
bazaltina [42]3 years ago
5 0

Answer:

The answer is D which is Selenium

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What is the total number of oxygen atoms on the right-hand side of this chemical equation?
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The chemical equation is

Cu(s) +4HNO3(aq) ⇒ Cu(NO3)2(aq) + 2NO2(g) + 2H2O(g)

Answer:

12

Explanation:

In the right hand side of the equation, there are three compound which contains O2, which are;

Cu(NO3)2 , number of oxygen atoms =3*2 =6

2NO2, number of oxygen atoms = 2*2=4

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Total number of oxygen atoms on the right side of equation = 6+4+2 =12

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