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BaLLatris [955]
2 years ago
15

Find the block labeled ? in Figure 2. What is its atomic number? How many valence electrons does it have? Which of the elements

shown in Figure 2 will it most resemble?

Chemistry
2 answers:
ra1l [238]2 years ago
7 0
That is Magnesium. its atomic number is 12 and has 2 valence electrons. it will most resemble beryllium (Be)
Vadim26 [7]2 years ago
4 0

The atomic number of the element is 12. The name of the element is magnesium. It has two valence electrons. The element it most resemble is Be, beryllium.

looking at the periodic table given in the question, we can see that the element we are looking for belong to group 2, thus, its properties will be similar to that of Be, which belong to the same group. The electronic configuration of magnesium is 2, 8, 2, this implies that, it has two electrons on its outermost shell.

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Answer:

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7 0
3 years ago
Tin (II) fluoride, formerly found in many kinds of toothpaste, is formed in this reaction: Sn (s) + 2HF (g) ——> SnF2 (s) + H2
Readme [11.4K]

1.34 L of HF

Explanation:

We have the following chemical reaction:

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First we calculate the number of moles of SnF₂:

number of moles = mass / molecular weight

number of moles of SnF₂ = 5 / 157 = 0.03 moles

From the chemical reaction we see that 1 mole of SnF₂ are produced from 2 moles of SnF₂. This will mean that 0.03 moles of SnF₂ are produced from 0.06 moles of HF.

Now at standard temperature and pressure (STP) we can use the following formula to calculate the volume of HF:

number of moles = volume / 22.4 (L/mole)

volume of HF = number of moles × 22.4

volume of HF = 0.06 × 22.4 = 1.34 L

Learn more about:

problems with gases at STP

brainly.com/question/8857334

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8 0
3 years ago
If two carbon atoms are bonded by a double covalent bond, how many additional bonds can each carbon atom form?
Umnica [9.8K]

Answer:

2

Explanation:

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Hence, to complete the property of its tetra valency, two more bonds needed to be added to the two carbon atoms

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Explanation:

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