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ser-zykov [4K]
3 years ago
12

Three elements are represented by the letters A, B, and C. the three elements have the same number of valence electrons. Element

C has electrons in three energy levels and element A is the lightest of the three. Elements B has a total of twenty electrons. Identify the elements.
Chemistry
1 answer:
AfilCa [17]3 years ago
3 0
Answer:
A- beryllium
B- calcium
C- magnesium

Explanation
NOTE: all element in group 2 have 2 balance electrons

First let’s start with B- number of electrons= number of protons which is equal to the atomic number. therefore, the answer is calcium as it’s atomic number is 20

C- magnesium will have three energy levels considering it has 12 electrons (2,8,2).

A- beryllium is the lightest one in group 2 as it has the atomic mass of 9.0122.
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Organic molecules are defined as chemical compounds that contain ______ in distinct ratios and structures.
OLga [1]

Answer:

The answer is: <em>carbon</em>

Explanation:

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A balanced chemical reaction obeys the law of...
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Answer: (C) conservation of matter

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For example:

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As,

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4 0
3 years ago
Read 2 more answers
Convert 3 mol of Co, to grams.
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Answer:

176.7996 grams

Explanation:

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3 0
2 years ago
How many moles of FeCl3 could be produced from 6.1 moles of Cly?<br> 2 Fe + 3Cl2 —&gt; 2 FeCl2
Black_prince [1.1K]

Answer:

4.1 moles of FeCl₃

Explanation:

The reaction expression is given as shown below:

         2Fe    +       3Cl₂   →    2FeCl₃

Number of moles of Cl₂  = 6.1moles

So;

  We know that from the balanced reaction expression:

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Therefore    6.1moles of Cl₂ will produce \frac{6.1 x 2}{3}   = 4.1 moles of FeCl₃

The number of moles is 4.1 moles of FeCl₃

6 0
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