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3 years ago

What do the elements highlighted in red have in common?

Chemistry

2 answers:

Scorpion4ik [409]3 years ago

6 0

The red elements are all in period 2

r-ruslan [8.4K]3 years ago

5 0

Answer:

The elements highlighted in red have in common the fact of belonging to the same period, which is period two. This makes electrons occupy up to level two.

Explanation:

In the periodic table you can distinguish horizontal divisions or rows called periods and vertical divisions or columns that are called groups.

The table is divided into periods that are listed from 1 to 7 from top to bottom. Elements that belong to the same period have different properties, but similar masses, because they have the same number of orbitals. That is, the elements of a given period are characterized by having electrons on the same outermost level, which is precisely the number that designates each period. For example, the elements of the third period have electrons up to level three. As the period number increases in the periodic table, the number of the energy level increases.

The elements highlighted in red have in common the fact of belonging to the same period, which is period two. This makes electrons occupy up to level two.

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If a gas has a volume of 1000 ML at a temperature of 23°C and a pressure of 100 mmhg, what is it’s volume under standard conditi

Colt1911 [192]

Answer:

119.7 mL.

Explanation:

From the general law of ideal gases:

PV = nRT.

where, P is the pressure of the gas.

V is the volume of the container.

n is the no. of moles of the gas.

R is the general gas constant.

T is the temperature of the gas (K).

For the same no. of moles of the gas at two different (P, V, and T):

P₁V₁/T₁ = P₂V₂/T₂.

P₁ = 100.0 mmHg, V₁ = 1000.0 mL, T₁ = 23°C + 273 = 296 K.

P₂ = 1.0 atm = 760.0 mmHg (standard P), V₂ = ??? mL, T₂ = 0.0°C + 273 = 273.0 K (standard T).

∴ V₂ = (P₁V₁T₂)/(T₁P₂) = (100.0 mmHg)(1000.0 mL)(273.0 K)/(296 K)(760.0 mmHg) = 121.4 mL.

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4 years ago

What is ionization energy

damaskus [11]

Ionization energy is the energy required to remove an electron from a gaseous atom or ion. The first or initial ionization energy or Ei of an atom or molecule is the energy required to remove one mole of electrons from one mole of isolated gaseous atoms or ions

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4 years ago

Which of the following is the correct set up AND answer to convert 6.25 x

BlackZzzverrR [31]

Answer:

Explanation:

How many mols do you have?

1 mol = 6.02 * 10^23 atoms

x mol = 6.25 * 10 ^32 atoms

1/x = 6.02*10^23 / 6.25 * 10^32 Cross multiply

6.02 * 10^23 * x = 1 * 6.25 * 10^32 Divide by 6.02 * 10^23

x = 6.25 * 10*32/ 6.02 ^10^23

x = 1.038 * 10^9 mols which is quite large.

Find the number of grams. (Use the value for copper on your periodic table. I will just use an approximate number.)\

1 mol of copper = 63 grams.

1.038 * 10^9 mols of copper = x

1/1.038 * 10^9 = 63/x Cross multiply

x = 1.038 * 10^9 * 63

x = 6.54 * 10^10 grams of copper.

7 0

3 years ago

What is the mass of 4.2 x 10^24 molecules of Ca(OH)2

kvv77 [185]

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6 0

3 years ago

Read 2 more answers

Ira Lisetskai [31]

Answer:

$410mg/day *\frac{1000 ug}{1 mg}$

Recommended daily Amount (RDA) of magnesium is 410,000 μg/day.

Explanation:

There are 1000μg in 1 mg and 1000 mg in 1g

1 mg=1000μg

The Recommended daily Amount (RDA) is 410 mg/day of magnesium. Converting 410 mg/day into μg/day

$410mg/day *\frac{1000 ug}{1 mg}$

It will become 410,000 μg/day

So Recommended daily Amount (RDA) of magnesium is 410,000 μg/day.

4 0

3 years ago