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3 years ago

Which of the following elements would exhibit the greatest shielding effect?

2 answers:

5 0

Rubidium because it is lower on the periodic table and therefore has more electrons to shield the valence electrons from the positive core

Korolek [52]3 years ago

5 0

Answer: Option (D) is the correct answer.

Explanation:

Shielding effect is the effect in which nucleus of an atom is surrounded by number of electrons in such a manner that there will be decrease in attraction between nucleus and valence electrons.

So, more is the number of shells present in an atom more will be its shielding effect. Whereas smaller is the size of atom more will be attraction between its nucleus and valence electrons. So, it would be difficult to remove an electron from the valence shell.

For example, rubidium is larger in size so it has more number of shells and thus more shielding effect.

Thus, we can conclude that out of the given options rubidium would exhibit the greatest shielding effect.

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When an aqueous solution of magnesium nitrate is mixed with an aqueous solution of potassium carbonate, ____________.?

spin [16.1K]

<span>Ca(NO3)2 + Na2CO3 = CaCO3 + 2NaNO3
Yes a precipitate of Calcium Carbonate is formed since it is insoluble in water.
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3 years ago

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anastassius [24]

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3 years ago

12.A piece of magnesium is in the shape of a cylinder with a height of 5.62 cm

yaroslaw [1]

Answer:

Density, d = 1.779 g/cm³

Explanation:

The density of a material is given by its mass per unit volume.

Here, height of a piece of magnesium cylinder, h = 5.62 cm

Its diameter, d = 1.34 cm

Radius = 0.67 cm

Volume of he cylinder,

$V=\pi r^2 h\\\\\text{Putting the value of r and h, we get :}\\\\V=(\pi \times (0.67)^2\times 5.62)\ cm^3$

$d=\dfrac{m}{V}\\\\d=\dfrac{14.1\ g}{(\pi \times (0.67)^2\times 5.62)\ cm^3}\\\\d=1.779\ g/cm^3$

So, the density of the sample is 1.779 g/cm³.

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3 years ago