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3 years ago

Differentiate between short period and long period in modern periodic table

2 answers:

8 0

The difference between short period and long period is based upon the number of elements in each period. Shortest period is the first period which contains elements, while the longest period is the 6th period which contains 32 elements.

Radda [10]3 years ago

5 0

Both these contain 18 elements each. The shortest period which contains two elements, while the longest period is the 6th period which contains 32 elements.

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Why does atomic radius increase across Period 3?

bezimeni [28]

An atomic radius decrease across Period 3 because the number of shells not increases but the number of electron increases and the atomic size decreases as the effective nuclear charge increases.

When we move in the period 3 from left to the right the atomic radius decreases because of the reason that the the number of shells don not change they will remain the same across the period but the number of the electron will increases . the effective nuclear charge will also increases. the nucleus will attract the electrons more strongly that the reason the atomic radius decreases.

Thus, number of electron increases and the number of shells will remain same , the atomic size decreases as the effective nuclear charge increases.

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11 months ago

What is the primary source of energy for most ecosystems

Aleonysh [2.5K]

Sun is the primary source of energy.

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3 years ago

Read 2 more answers

True or false

m_a_m_a [10]

It is false because seven electrons is a characteristic of the halogen elements

7 0

3 years ago

If two hydrogen (H) atoms combined to form a helium (He) atom, a ________ reaction has occurred.

Dominik [7]

A. fusion

A fusion reaction is when two smaller molecules join to form a larger molecule and energy is relased

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3 years ago

For ethanol, propanol, and n-butanol the boiling points, surface tensions, and viscosities all increase. What is the reason for

vekshin1

Answer:

First choice. The boiling points, surface tension, and viscosities all increase because the strength of dispersion forces increases.

Explanation:

Those properties, boiling points, surface tension, and viscosities are due to the attractive intermolecular forces of the substances.

Ethanol, propanol, and n-butanol (three alcohols) have these chemical formulae:

Ethatnol: CH₃CH₂ OH
Propanol: CH₃ CH₂ CH₂ OH
n-butanol: CH₃CH₂ CH₂ CH₂ OH

So, the molecules of those substances are polar and exhibit all these types of intermolecular bonding forces:

Dipole-dipole interactions: attractive forces between the positive end of one polar molecule and the negative end of another polar molecule;

London dispersion forces: a temporary attractive force that results of temporary assymetry in the electron distribution around the nuclei. This occurs when the electrons in two adjacent atoms occupy positions that cause the atoms form temporary dipoles. These forces exist between any two molecules when they are very, very close to each other (almost touching).

Hydrogen bonding: the strongest intermolecular force. It is a type of dipole-dipole attraction, which arises between an hydrogen atom covalently bonded to a very electronegative atom (in this case oxygen) and the very electronegative atom (oxygen) of a neighboor molecule.

What answer your question is that such hydrogen bonding and dipole-dipole interactions are similar for all the three alcohols, ethanol, propanol, and n-butanol, so they are not responsible for the difference in the mentioned properties, boiling points, surface tension, and viscosities. What is different is the dispersion forces: they increase as the size of the alcohols increase.

As the molecules contain more carbon atoms, lengthen, contain more electrons and, as consequence, the dispersion forces become greater (the magnitude of the temporary dipoles formed increase). This explains the validity of the first statement, that the boiling points, surface tension, and viscosities, all increase because the strength fo the dispersion forces increase.

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3 years ago

Differentiate between short period and long period in modern periodic table​

Differentiate between short period and long period in modern periodic table