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4 years ago

14

Which of the following properties decrease down a column in the periodic table?

2 answers:

GenaCL600 [577]4 years ago

4 0

Answer: B. ionization energy

Which of the following properties decrease down a column in the periodic table?

A. effective nuclear charge

B. ionization energy

C. atomic radii

D. ionic radii

Explanation:

I just took the test and the correct answer is B. ionization energy!

Good Luck!!

dsp734 years ago

3 0

Answer:

Effective nuclear charge and ionization energy decreased down in the column.

Explanation:

Along Group:

As we move from top to bottom in group the atomic size increases with increase of atomic number. The electron is added into the next shell hence the valance electrons farther away from the nucleus and hold of nucleus become weaker on the valance electrons. The addition of electrons also increase the shielding and protect the outer electrons from the hold of nucleus. Thus it becomes easier to remove the electron from an atom and less energy is required that's why ionization energy decreases from top to bottom and effective nuclear charge also decrease because of shielding effect.

Along period:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons and shielding remain constant due to addition of electron in same shell. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases.

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How many grams are needed to make 2 L of solution of 4 M LiNO3?

katen-ka-za [31]

Answer:

552 g of LiNO₃

Explanation:

From the question given above, the following data were obtained:

Volume of solution = 2 L

Molarity of LiNO₃ = 4 M

Mass of LiNO₃ =?

Next, we shall determine the number of mole of LiNO₃ in the solution. This can be obtained as follow:

Volume of solution = 2 L

Molarity of LiNO₃ = 4 M

Mole of LiNO₃ =?

Molarity = mole /Volume

4 = mole of LiNO₃ / 2

Cross multiply

Mole of LiNO₃ = 4 × 2

Mole of LiNO₃ = 8 moles

Finally, we shall determine the mass of of LiNO₃ needed to prepare the solution. This is can be obtained as follow:

Mole of LiNO₃ = 8 moles

Molar mass of LiNO₃ = 7 + 14 + (16×3)

= 7 + 14 + 48

= 69 g/mol

Mass of LiNO₃ =?

Mole = mass /Molar mass

8 = Molar mass of LiNO₃ /69

Cross multiply

Molar mass of LiNO₃ = 8 × 69

Molar mass of LiNO₃ = 552 g

Thus, 552 g of LiNO₃ is needed to prepare the solution.

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3 years ago

How often does the water cycle occur on earth?

elena55 [62]

Answer:

A

Explanation:

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3 years ago

Global climatic patterns are changing because of the melting of polar ice caps. The melting of polar ice caps is an example of t

Kryger [21]

Answer:

atmosphere and hydrosphere

Explanation:

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4 years ago

How does the atomic radius of an element is related to its metallic character

Aneli [31]

Answer:

The large the atomic radius the more the metallic character of elements

Explanation:

The atomic radius is related to the metallic character in a way that the larger the atomic radius, the more metallic a body becomes.

Therefore, as we go down a group, metallic character increases.

Metallic character relies on the ability and willingness of an atom to share its valence electrons.
As the size of an atom becomes large, the more metallic it is and the more its metallic character.
In some other cases this character is known as electropositivity.

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All of the above

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