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AnnZ [28]
3 years ago
9

What is the difference between the number of electrons in an atom of selenium,Se, and the number of electrons in an atom of alum

inum,Al?
A)21
B)17
C)8
D)14
Chemistry
2 answers:
aliina [53]3 years ago
5 0

Answer:

A)21

Explanation:

To know the difference between the number of electrons in the two atoms, we must first know the number of electrons in the atoms.

For Selenium, Se, we have 34 electrons. The element is in group 6 on the periodic table.

Aluminum on the other hand is in the Boron family with a total of 13 electrons.

The difference,( 34-13) electrons gives a total of 21 electrons

strojnjashka [21]3 years ago
5 0

Answer:

a.21

Explanation:

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Which of the following samples will have the greatest volume at STP?
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Answer:

Option b. 22 g of He will have the greatest volume at STP

Explanation:

In order to determine the volume, we apply the Ideal Gases Law equation:

P . V = n . R . T

V = n . R . T / P

R, T and P are the same in all the situation we must define n (number of moles).

The one that has the greatest number of moles will have the greatest volume at STP

22 g of Ne . 1mol / 20.1 g = 1.09 moles of Ne

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7 0
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Which pair of atoms has the highest electronegativity difference? Na-F Ca-F H-F C-F F-F
babunello [35]
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3 years ago
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2 Na + Cl2 --&gt; 2 NaCl<br> What is the mole ratio of sodium to sodium chloride?
Irina18 [472]

Answer: The mole ratio of sodium to sodium chloride 2:2.

Explanation:

As the given reaction equation is as follows.

2Na + Cl_{2} \rightarrow 2NaCl

Here, 2 moles of sodium reacts with 1 mole of Cl_{2} and leads to the formation of 2 moles of NaCl.

This means that 2 moles of sodium gives 2 moles of NaCl on reaction with chlorine.

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2 years ago
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