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3 years ago

Why are negative ions larger than the neutral atom from which they form?

Chemistry

1 answer:

Tom [10]3 years ago

4 0

Answer:

A. because the addition of electrons results in an added energy level

Explanation:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

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. 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 .

In both of case when extra electron is added the atom becomes anion and anionic radii is larger than neutral atom because of addition of electrons results in an added energy level.

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What causes cold, deep ocean currents to form in the ocean currents near the poles?

lianna [129]

What causes deep, cold currents to form in the oceans near the poles? The sinking of dense, cold water paired with high salinity.

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2 years ago

A recipe for bread states that the dough must bake for 40 minutes at a temperature of 190°C. The oven you are using has temperat

Mila [183]

Answer:

374°F

463.15K

Explanation:

This particular Question wants to test knowledge on the conversion of the units of temperature from celsius degree to degree Fahrenheit. Also, the conversion of degree celsius to kelvin.

The value given which is 190 degree celsius can be converted into degree Fahrenheit using the formula below;

(x°C × 9/5 ) + 32.

Therefore, x = 190°C =( 190°°C × 9/5) + 32 = 374°F.

The conversion of degree celsius to kelvin is given below as;

x°C + 273.15 .

Therefore, x = 190°C = 190°C + 273.15 = 463.15K.

Therefore, the temperature needed to bake at Fahrenheit and kelvin are 374°F and 463.15K respectively.

8 0

3 years ago

How many moles are in 48 molecules of H2O? What is the given amount?

Mkey [24]

Answer:

1.635

Explanation:

7 0

3 years ago

Read 2 more answers

You fill a balloon with helium gas to a volume of 2.68L at 23°C and 789mmHg. Then you release the balloon and it rises. What wil

wlad13 [49]

Answer : The final volume of balloon will be, 3.35 L

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}{V}$

or,

$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure = 789 mmHg

$P_2$ = final pressure = 632 mmHg

$V_1$ = initial volume = 2.68 L

$V_2$ = final volume = ?

Now put all the given values in the above equation, we get:

$789mmHg\times 2.68L=632mmHg\times V_2$

$V_2=3.35L$

Therefore, the final volume of balloon will be, 3.35 L

3 0

3 years ago

If you performed this experiment using mgcl2 as the solute would the molar concentration of mgcl2 that is isotonic to the potato

Mama L [17]

The answer to this question would be: lower molar concentration

Osmotic pressure is influenced by the number of ions and the concentration of the molecule in the solution. In NaCl, the molecule will split into 1 Na+ ion and 1 Cl- ion which results in 2 ions per compound. In MgCl2, the compound will split into 1 Mg2+ ion and 2 Cl- ion which results in 3 ions. Therefore, the osmotic pressure of MgCl2 will be 3/2 times of NaCl.
MgCl2 will need less concentration to achieve same osmotic pressure as NaCl. If the MgCl2 solution is isotonic with NaCl, the concentration of MgCl2 would be lower than NaCl

5 0

4 years ago