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Lelu [443]
3 years ago
11

In which of the following is the number of neutrons correctly represented? A. fluorine: atomic number 9, mass 19, neutrons 0 B.

arsenic: atomic number 33, mass 75, neutrons 108 C. magnesium: atomic number 12, mass 24, neutrons 24 D. uranium: atomic number 92, mass 238, neutrons 146
Chemistry
2 answers:
Digiron [165]3 years ago
4 0
D. uranium: atomic number 92, mass 238, neutrons 146

238-92=146
earnstyle [38]3 years ago
3 0

<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

Atomic number is defined as the number of protons that are present in an atom. It is represented as Z.

Z = Atomic number = Number of protons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.  It is represented as A.

A = Mass number = Number of protons + Number of neutrons

For the given options:

  • <u>Option A:</u> Fluorine

Atomic number = 9

Mass number = 19

Number of neutrons = 19 - 9 = 10

Thus, the number of neutrons are not represented correctly.

  • <u>Option B:</u> Arsenic

Atomic number = 33

Mass number = 75

Number of neutrons = 75 - 33 = 42

Thus, the number of neutrons are not represented correctly.

  • <u>Option C:</u> Magnesium

Atomic number = 12

Mass number = 24

Number of neutrons = 24 - 12 = 12

Thus, the number of neutrons are not represented correctly.

  • <u>Option D:</u> Uranium

Atomic number = 92

Mass number = 238

Number of neutrons = 238 - 92 = 146

Thus, the number of neutrons are represented correctly.

Hence, the correct answer is Option D.

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What are 6 abiotic factos from finding nemo?
julsineya [31]

Abiotic are nonliving things. So just name 6 nonliving things in finding nemo
8 0
3 years ago
3
Bess [88]

Answer:

4Al + 3O₂ →   2Al₂O₃

Explanation:

    4Al + 3O₂ →   2Al₂O₃

Only this reaction above obeys the law of conservation of mass. The others flout the rule.

The law of conservation of mass states that "matter is neither created nor destroyed in a chemical reaction but are simply transformed from one form to another".

By this law, the number of atoms on both sides of expression must be the same;

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Elements              Left hand side                                 Right hand side

  Al                                    4                                                     4

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8 0
3 years ago
1.29 g piece of lead has a temperature of 26.0 °C. If it loses 1.90 J of heat to its surroundings, what is its new temperature.
malfutka [58]

The new temperature of the piece of lead will be 37.5°C

SPECIFIC HEAT CAPACITY:

  • The amount of heat absorbed or released by a substance can be calculated by using the following formula:

Q = m × c × ∆T

Where;

Q = quantity of heat absorbed or released (J)

m = mass of substance (g)

c = specific heat capacity

∆T = change in temperature (°C)

According to this question,

Q = 1.90J

m = 1.29g

T1 = 26°C

T2 = ?

c = 0.128 J/g°C

1.90 = 1.29 × 0.128 × (T2- 26°C)

1.90 = 0.165 (T2 - 26°C)

1.90 = 0.165T2 - 4.29

1.90 + 4.29 = 0.165T2

6.19 = 0.165T2

T2 = 37.5°C

Therefore, the new temperature of the piece of lead will be 37.5°C.

Learn more: brainly.com/question/20514651?referrer=searchResults

5 0
2 years ago
Which of the following statements are false? I. It takes less energy to add an electron to nitrogen than to carbon because nitro
Vedmedyk [2.9K]

Answer:

I and II

Explanation:

I. It will take more energy to add an electron to nitrogen than to carbon in order to achieve a noble gas configuration because nitrogen the outer shell (p-orbital) of nitrogen is filled with three electrons which will require alot of energy to add the required five electrons to achieve a noble gas configuration. Carbon on the other hand has four electrons in its outer shell which makes it more closer to achieving a noble gas configuration than nitrogen

II. The radius of flourine is not smaller compared to oxygen because fluorine has more electron than oxygen this makes its atomic radius increases due to the addition of energy shell.

7 0
3 years ago
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