1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
nirvana33 [79]
3 years ago
15

The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below

Chemistry
2 answers:
Nataly [62]3 years ago
7 0
The answer is 4 neutrons
Hope this helped!
Luba_88 [7]3 years ago
5 0

Answer:

Lithium has 4 neutrons

Explanation:

The number shown above the lithium symbol (Li) is the mass number.

The mass number (A) represents the protons and neutrons an atom has.

The atomic number(Z) in the other hand represents the protons only.

So, the difference between this two numbers is the amount of neutrons.

n_{neutrons}=A-Z=7-3=4

You might be interested in
Which of these is a benefit of nuclear fusion?
dybincka [34]

Answer:

B. There is a lower risk of runaway chain reactions.

Explanation:

Ap Ex Confirmed

8 0
2 years ago
Lonic or Covalent? Fe2O3
yan [13]
Fe2o3 this is covalent
8 0
3 years ago
Comment Both propane and benzene are hydrocarbons. As a rule,
kozerog [31]

The enthalpy change : -196.2 kJ/mol

<h3>Further explanation  </h3>

The change in enthalpy in the formation of 1 mole of the elements is called enthalpy of formation  

The enthalpy of formation measured in standard conditions (25 ° C, 1 atm) is called the standard enthalpy of formation (ΔHf °)  

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)  

The value of ° H ° can be calculated from the change in enthalpy of standard formation:  

∆H ° rxn = ∑n ∆Hf ° (product) - ∑n ∆Hf ° (reactants)  

Reaction

2 H₂O₂(l)-→ 2 H₂O(l) + O₂(g)

∆H ° rxn = 2. ∆Hf ° H₂O - 2. ∆Hf °H₂O₂

\tt \Delta H_{rxn}=2.(-285.8)-2.(-187.8)\\\\\Delta H_{rxn}=-571.6+375.4=-196.2~kJ/mol\rightarrow \Delta Hf~O_2=0

5 0
3 years ago
Would you expect the wavelength of maximum absorbance for [Cu(NH3)4]2+ to be greater than or less than the wavelength of maximum
DENIUS [597]

Answer:

Less

Explanation:

Since [Cu(NH3)4]2+ and [Cu(H2O)6]2+ are Octahedral Complexes the transitions between d-levels explain the majority of the absorbances seen in those chemical compounds. The difference in energy between d-levels is known as ΔOh (ligand-field splitting parameter) and it depends on several factors:

  • The nature of the ligand: A spectrochemical series is a list of ligands ordered on ligand strength. With a higher strength the ΔOh will be higher and thus it requires a higher energy light to make the transition.
  • The oxidation state of the metal: Higher oxidation states will strength the ΔOh because of the higher electrostatic attraction between the metal and the ligand

A partial spectrochemical series listing of ligands from small Δ to large Δ:

I− < Br− < S2− < Cl− < N3− < F−< NCO− < OH− < C2O42− < H2O < CH3CN < NH3 < NO2− < PPh3 < CN− < CO

Then NH3 makes the ΔOh higher and it requires a higher energy light to make the transition, which means a shorter wavelength.

7 0
3 years ago
What happens to these physical properties as the strength of intermolecular forces increases?Increase or decrease?a) melting poi
docker41 [41]

Boiling Point, Melting Point, Viscosity, Surface Tension. Decrease: Vapor Pressure.

6 0
3 years ago
Other questions:
  • given the reaction 2c2h6 7o2 4co2 6h2o at stp what is the total volume of co2 formed when 6.0 liters of c2h6 are completely oxid
    15·1 answer
  • opnTens Location: Test: Question 1 of 40)ToolsThermal energy travels through space from the Sun to Venus. This is an example ofA
    8·1 answer
  • How are sublimation and evaporation. similar
    9·1 answer
  • Which of the following types of reactions would decrease the entropy within a cell? A. Dehydration reaction, B. Hydrolysis, C. R
    14·1 answer
  • What property of matter does not change even though the appearance may
    13·2 answers
  • Which of the following are chemical properties of baking soda? Choose all that are correct.
    13·1 answer
  • How many grams of lactic acid are in 1 liter of lactic acid?
    12·1 answer
  • Anthony made a pitfall trap by burying a small glass in the ground so that the top of the glass was exactly level with the groun
    6·1 answer
  • Lewis structures are used to represent ___.
    14·2 answers
  • Why are the terrestrial planets closest to the sun while the gas planets are farther from the sun?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!