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4 years ago

Which atom or ion is the largest?

Chemistry

1 answer:

Lerok [7]4 years ago

3 0

Size

As the charge increases (becomes more positive), the size decreases.

Also the number of protons and electrons matters in the atom itself. Li will have the smallest size because their are not that many electrons to repulse as say the Ca and K.

The largest member of that group is the one having the most number of electrons and is not an ion. In general the higher the charge, the smaller the radius.

K > K+ > Ca2+

Answer: A

Ionization Energy

As you go down the periodic table staying in the same column of the periodic table it takes LESS energy to break the outer shell electrons away. So the correct order for the column II elements is something like D.

Be is closest to the top of the periodic table and has the highest ionization energy

Ca is the next closest to the top and has a medium size ionization energy

Sr has the lowest ionization energy.

Answer C is backwards.

Answers A B and E are all in the wrong order of moving down Column II. The comment applies to staying in the same column and moving from top to bottom.

Polymers

A polymer is a complex combination of Carbon, Hydrogen and Oxygen (mainly). Other elements are possible but the majority is the listed ones.

DNA is a polymer

A glass bottle is made from SiO2 and is not a polymer

Ice crystals are actually water molecules. Those crystals are not polymers

Hair Proteins (like wool and silk) are made of polymers.

Rubber used for car tires are polymers.

You should count 3 items as your answer.

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A cube has sides of 11.4 cm. What is its volume?

Galina-37 [17]

Answer:

$1442.556 cm^{3}$

Explanation:

Volume is the space occupied by an object. A cube has edges/sides of equal length. Its volume can be calculated by

Volume = side * side * side

= 11.4 cm * 11.4 cm* 11.4 cm

= 1442.556 cm3

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3 years ago

Outer core made of alloy metal, mostly

igor_vitrenko [27]

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3 years ago

A solution contains one or more of the following ions: Ag , Ca2 , and Co2 . Lithium bromide is added to the solution and no prec

koban [17]

Answer:

$Ca^{2+} and Co^{2+}$

Explanation:

Given:

A solution contains one or more of the following ions such as Ag, $Ca_2$ and $Co_2$

Here the Lithium bromide is added to the solution and no precipitate forms

Solution:

Since with LiBr no precipitation takes place therefore Ag+ is absent

Here on adding $Li_2SO_4$ to it precipitation takes place.

Precipitate is as follows,

$Ca^{2+}(aq)+SO_4^2^-(aq)----->CASO_4(s)$

Thus,

$Ca^2^+$ is present

When $Li_3PO_4$ is added again precipitation takes place.

Therefore the reaction is as follows,

$Co^2^+(aq)+PO_4^3^-(aq)------>Co_3(PO_4)_2(s)$

Therefore,

$Ca^{2+} and Co^{2+}$ are present in the solution

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3 years ago

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ivanzaharov [21]

Explanation:

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