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Tpy6a [65]
3 years ago
7

The element X has 2 valence electrons. its is a

Chemistry
1 answer:
Lesechka [4]3 years ago
6 0

helium, beryllium, magnesium, calcium, strontium, barium, radium. i believe any of these are proper answers.


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Which of the following has the smallest radius? <br> A. O^2- <br> B. F^- <br> C. Li^- <br> D. Be^2+
nordsb [41]

Answer : The correct option is, (D) Be^{2+}

Explanation :

Effective nuclear charge : It is defined as the attraction of the protons present in the nucleus of an atom to the outermost electrons.

For ions, the effective nuclear charge changes than the neutral atom.

There are two types of ions:

Cations: They are formed when an atom looses its valence electrons. They are positive ions.

Anions: They are formed when an atom gain electrons in its outermost shell. They are negative ions.

For positive ions, the removal of electron increases the nuclear charge for an outermost electron because the outermost electrons are more strongly attracted by the nucleus. Thus, the effective nuclear charge increases for cations.

From this we conclude that, the size of the cation is smaller than their neutral atom because it has less number of electrons while its nuclear charge remains the same. So, the nucleus attracts the electron more towards itself and leads to the decrease in size.

For negative ions, the addition of electron decreases the nuclear charge for an outermost electron because the outermost electrons are less strongly attracted by the nucleus. Thus, the effective nuclear charge decreases for anions.

From this we conclude that, the size of the anion is greater than their neutral atom because it has more number of electrons while its nuclear charge remains the same. So, the nucleus attracts the electron less towards itself and leads to the increase in size.

Thus, the increasing order of radius of ions will be:

Be^{2+}

Hence, the smallest radius of ion is, Be^{2+}

4 0
3 years ago
In general ethers have a much lower boiling point than their isomeric alcohols. why?
Alex Ar [27]

Ethers have a much lower boiling point than their isomeric alcohols because ether have not hydrogen bond that why ethers have lower boiling point .

Ethers will not have a hydrogen atom attached to the oxygen atom as alcohols do. Because ether molecules can not form intermolecular hydrogen bonds, their boiling points are much shorter than those of alcohol with such a comparable mass.

Owing to the combination of intermolecular H-bonding in alcohols though not in ethers, alcohols possess higher boiling temperatures than isomeric ethers.

Therefore, ethers have a much lower boiling point than their isomeric alcohols because ether have not hydrogen bond that why ethers have lower boiling point .

To know more about boiling point

brainly.com/question/2153588

#SPJ4

4 0
1 year ago
How does adding a non-volatile solute to a pure solvent affect the boiling point of the pure solvent?
belka [17]
The correct answer is the second statement. The solvent will have a higher boiling point. Adding a non-volatile solute to a pure solvent will increase the boiling point of the solvent. This solution exhibit colligative properties. Colligative properties depend on the amount of solute dissolved in a solvent. These set of properties do not depend on the type of species present. 
7 0
3 years ago
How many atoms does h20 have and how many elements does h20 have?
SVEN [57.7K]

Answer:

h20 has 3 atoms

Explanation:

2 hydrogen atoms and 1 oxygen atom

7 0
3 years ago
Read 2 more answers
A molecule of nitrogen gas consists of two nitrogen atoms joined together. Write the formula of nitrogen gas.
Xelga [282]
<span>The formula for nitrogen gas is N2<span>

your welcome!</span></span>
4 0
3 years ago
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