The true about element in period or horizontal row of periodic table is
Each element has one more outer electron than the element before it. (answer B)
<u><em> Explanation</em></u>
In periodic table there are four horizontal rows(periods) that is period 1,2,3 and 4.
Across the period each element has one more electron than element before it.
For example Na and Mg which are in periodic 3.
Na has 2.8.1 or [Ne] 3s¹ electron configuration while Mg has 2.8.2 or [Ne] 3S² electron configuration.
Since Mg has 2 outer electrons while Na has 1 outer electron, Mg has more electron than Na.
Answer:
B
Explanation:
Isotopes have the same number of protons but different number of neutrons.
The balanced skeleton reactions are given below
Cr₂O₇²⁻(aq) +3Zn(s) + 14(aq) → 3Zn²⁺(aq) +2 Cr³⁺(aq) + 7(l)
The oxidising agent and reducing agents are Cr₂O₇²⁻ and Zn.
There are following steps involve in balance redox reaction in acidic medium .
- First divide the reaction into two half reactions .
- Balance the elements other than oxygen and hydrogen atom.
- Balance the oxygen atom by adding on that side where number of oxygen atom is less .
- Balance the hydrogen atom by adding on another side of in which water attached .
- Balance the charge by adding .
- Add the two half reaction .
The species which reduces the other species in the redox reaction is called reducing agent . Similarly , the species which oxidize the other species in the redox reaction is called reducing agent .
To learn more about reducing agents please click here ,
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C. Decreasing the temperature
D. Raising the pressure
<h3>Further explanation</h3>
Given
Reaction
2SO₂+O₂⇔2SO₃+energy
Required
Changes to the formation of products
Solution
The formation of SO₃ is an exothermic reaction (releases heat)
If the system temperature is raised, then the equilibrium reaction will reduce the temperature by shifting the reaction in the direction that requires heat (endotherms). Conversely, if the temperature is lowered, then the equilibrium shifts to a reaction that releases heat (exothermic)
While on the change in pressure, then the addition of pressure, the reaction will shift towards a smaller reaction coefficient
in the above reaction: the number of coefficients on the left is 3 (2 + 1) while the right is 2
As the temperature decreases, the equilibrium will shift towards the exothermic reaction, so the reaction shifts to the right towards SO₃( products-favored)
And increasing the pressure, then the reaction shifts to the right SO₃( products-favored)⇒the number of coefficients is greater