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spayn [35]
3 years ago
12

What ion will be formed by the selenium atom shown below when it has a stable set of valence electrons?

Chemistry
1 answer:
Bas_tet [7]3 years ago
3 0

Answer:

Explanation:

D. Se2−

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What is Mendeleev’s Periodic Law? How many elements were classified by Mendeleev?
ivann1987 [24]

Answer:

The physical and chemical properties of elements are periodic function of their atomic weights. This is Mendeleev's periodic law.

63 elements were classified by Mendeleev.

plz mark brainliest✌️✌️

3 0
3 years ago
Read 2 more answers
Fission involves the _________________ of an atom into smaller particles, while fusion occurs when smaller particles ___________
Norma-Jean [14]

Answer:

1.  Splitting

2. Combine

Explanation:

7 0
2 years ago
How much heat is lost when 575 g of molten iron at 1825 K becomes solid at 1181 K and cools to 293 K?
meriva
Answer is: -963,8 kJ.
Q₁ = m(Fe) · C · ΔT₁.
C - specific heat capacity of liquid iron, C(Fe) = 0,82 J/g°<span>C.
</span>m(Fe) = 575 g.
ΔT₁ = 1181 - 1825 = -644°C.
Q₁ = -859306,5 J = -859,3 kJ.
Q₂ = m(Fe) · C · ΔT₂.
ΔT₂ = 293 - 1181 = -888°C.
C - specific heat capacity, C(Fe) = 0,44 J/g°C.
Q₂ = -224664 J = -224,66 kJ.
Q₃ =- heat of fusion, ΔH = 209 J/g.
Q₃ = 120175 J = 120,17 kJ.
Q = Q₁ + Q₂ + Q₃ = -963,8 kJ.

7 0
3 years ago
Read 2 more answers
Chemical reactions forming ions _____.
Sergeu [11.5K]
The answer should be <span>balance electrically

</span><span>Chemical reactions that form ions should have a balanced charge. The example of the reaction is HCl. When forming ions, the equation should be:
HCl => </span>H^{+} + Cl^{-}
In this case, the hydrogen has one plus charge and chlorine has one negative charge. The resultant should be zero, so it's balanced.
4 0
3 years ago
Determine what is missing from this neutralization reaction: AgNO3+KCl→AgCl+−−−−
lapo4ka [179]

Answer:

The answer to your question is: KNO₃

Explanation:

                                AgNO3  +  KCl   →   AgCl  +   −−−−

A. KNO3    this option is correct because it is a double replacement reaction then potassium must attached to NO₃.

B. KOH  this product is not possible because there is no water to form OH⁻ ions.

C. Ag2K  this product is not possible because both Ag and K are metals, then it is difficult that they attach.

D. KN2O This product is imposible to form, this option is wrong.

7 0
3 years ago
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