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3 years ago

Every chlorine atom has(1) 7 electrons (2) 17 neutrons(3) a mass number of 35 (4) an atomic number of 17

Chemistry

2 answers:

fenix001 [56]3 years ago

6 0

(4) an atomic number of 17

tankabanditka [31]3 years ago

3 0

Every chlorine atom has $\boxed{\left(4\right){\text{ an atomic number of 17}}}$

Further explanation:

The smallest particle that is the building block of matter is known as an atom. Most of the space in an atom is empty and its mass is concentrated inside a small region called the nucleus.

Protons, electrons, and neutrons are the three subatomic particles that are present in the atom. Electrons revolve around the nucleus in definite orbits.

An atom is also written as $_{\text{Z}}^{\text{A}}{\text{X}}$ , where A is the atomic mass or mass number, Z is the atomic number and X is the letter symbol of the element.

Atomic number is equal to the number of protons present in the nucleus of the atom. Atomic mass is the total number of nucleons (protons and neutrons) within the atomic nucleus. It is also known as the mass number.

Isotopes:

Atoms of the same element with same atomic number but different mass numbers are called isotopes. These have the same number of protons but the number of neutrons is different. For example, $_{\text{6}}^{{\text{11}}}{\text{C}}$ and $_{\text{6}}^{{\text{12}}}{\text{C}}$ form isotopes of the same element carbon. These have the same atomic numbers (6) but different mass numbers (11 for $_{\text{6}}^{{\text{11}}}{\text{C}}$ and 12 for $_{\text{6}}^{{\text{12}}}{\text{C}}$ ).

Atomic number of any element is equal to the number of protons in it. But in case of neutral atom, it is also equal to the number of electrons. The atomic number of chlorine is 17 so the number of electrons in it is also 17 and therefore statement (1) is incorrect.

Chlorine exists in different isotopic forms that have different mass numbers so number of neutrons of every chlorine atom cannot always be the same. Therefore statements (2) and (3) are incorrect.

According to the position of chlorine in the periodic table, it is clear that its atomic number is 17. Every element has its own characteristic atomic number that is used to distinguish it from other elements. So every chlorine atom has an atomic number of 17. Therefore statement (4) is correct.

Learn more:

1. The major contribution of Antoine Lavoisier to chemistry: brainly.com/question/2500879

2. The number of significant figures: brainly.com/question/5222111.

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Atomic Structure

Keywords: chlorine, atomic number, mass number, 17, periodic table, isotopes, same element, protons, electrons, neutrons, position, periodic table.

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maria [59]

Answer:

1) 1.52 atm.

2) 647.85 K.

3) 20.56 L.

4) 1.513 mole.

5) 254.22 K = -18.77 °C.

Explanation:

In all this points, we should use the law of ideal gas to solve this problem: PV = nRT.
Where, P is the pressure (atm), V is the volume (L), n is the number of moles, R is the general gas constant (0.082 L.atm/mol.K), and T is the temperature (K).

1) In this point; n, R, and T are constants and the variables are P and V.

P and V are inversely proportional to each other that if we have two cases we get: P1V1 = P2V2.

In our problem:

P1 = ??? (is needed to be calculated) and V1 = 45.0 L.

P2 = 5.7 atm and V2 = 12.0 L.

Then, the original pressure (P1) = P2V2 / V1 = (5.7 atm x 12.0 L) / (45.0 L) = 1.52 atm.

2) In this case, n and R are the constants and the variables are P, V, and T.

P and V are inversely proportional to each other and both of them are directly proportional to the temperature of the gas that if we have two cases we get: P1V1T2 = P2V2T1.

In our problem:

P1 = 212.0 kPa, V1 = 32.0 L, and T1 = 20.0 °C = (20 °C + 273) = 293 K.

P2 = 300.0 kPa, V2= 50.0 L, and T2 = ??? (is needed to be calculated)

Then, the temperature in the second case (T2) = P2V2T1 / P1V1 = (300.0 kPa x 50.0 L x 293 K) / (212.0 kPa x 32.0 L) = 647.85 K.

3) In this case, P, n and R are the constants and the variables are V, and T.

V and T are directly proportional to each other that if we have two cases we get: V1T2 = V2T1.

In our problem:

V1 = 25.0 L and T1 = 65.0 °C + 273 = 338 K.

V2 = ??? (is needed to be calculated) and T2 = 5.0 °C + 273 = 278 K.

Herein, there is no necessary to convert T into K.

Then, the volume in the second case (V2) = V1T2 / T1 = (25.0 L x 278 °C) / (338 °C) = 20.56 L.

4) We can get the number of moles that will fill the container from: n = PV/RT.

P = 250.0 kPa, we must convert the unit from kPa to atm; 101.325 kPa = 1.0 atm, then P = (1.0 atm x 250.0 kPa) / (101.325 kPa) = 2.467 atm.

V = 16.0 L.

R = 0.082 L.atm/mol.K.

T = 45 °C + 273 = 318 K.

Now, n = PV/RT = (2.467 atm x 16.0 L) / (0.082 L.atm/mol.K x 318 K) = 1.513 mole.

5) In this case, V, n and R are the constants and the variables are P, and T.

P and T are directly proportional to each other that if we have two cases we get: P1T2 = P2T1.

In our problem:

P1 = 2200.0 mmHg and T1 = ??? (is needed to be calculated) .

P2 = 2700.0 mmHg and T2 = 39.0 °C + 273 = 312.0 K.

Herein, there is no necessary to convert P into atm.

Then, the temperature in the morning (T1) = P1T2 / P2 = (2200.0 mmHg x 312.0 K) / (2700.0 mmHg) = 254.22 K = -18.77 °C.

6 0

4 years ago

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Commercial concentrated aqueous ammonia is 28% nh3 by mass and has a density of 0.90 g/ml. what is the concentration of ammonia

patriot [66]

Answer:- 14.9 M

Solution:- Given commercial sample of ammonia is 28% by mass. Let's say we have 100 grams of the sample. Then mass of ammonia would be 28 grams.

Density of the solution is given as 0.90 grams per mL.

From the mass and density we could calculate the volume of the solution as:

$100g(\frac{1mL}{0.90g})$

= 111 mL

Let's convert the volume from mL to L as molarity is moles of solute per liter of solution.

$111mL(\frac{1L}{1000mL})$

= 0.111 L

Now, we convert grams of ammonia to moles on dividing the grams by molar mass. Molar mass of ammonia is 17 gram per mole.

$28g(\frac{1mole}{17g})$

= 1.65 mole

To calculate the molarity we divide the moles of ammonia by the liters of solution:

$molarity=\frac{1.65mole}{0.111L}$

= 14.9 M

So, the molarity of the given commercial sample of ammonia is 14.9 M.

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4 years ago

A chemical equation that does not indicate relative amounts of reactants and products is called

Zielflug [23.3K]

Answer:

The correct answer is skeleton equation.

Explanation:

In chemistry, the skeletal formula of a compound is an abbreviated representation of its molecular structure. Skeleton formulas are used because they clearly show complicated structures, they are fast and simple to draw.

All atoms that are not carbon or hydrogen are represented by their chemical symbol. The relative amounts of reagents and products are not indicated.

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Arte-miy333 [17]

Answer:

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Explanation:

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Marianna [84]

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7 0

3 years ago

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