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
ziro4ka [17]
3 years ago
9

an atom has 79 protons, 78 electrons and a mass number of 118. how many neutrons does this atom have​

Chemistry
1 answer:
igomit [66]3 years ago
4 0

Answer:

39

Explanation:

Electrons weigh almost nothing, so their mass doesn't really matter for these types of problems. Just subtract 118-79 to find the remaining mass which is for the neutrons.

You might be interested in
A compound has a percent composition of 15.24% sodium (molar mass = 22.99
RUDIKE [14]

The empirical formula of the compound obtained from the question given is NaBrO₃

<h3>Data obtained from the question </h3>
  • Sodium (Na) = 15.24%
  • Bromine (Br) = 52.95%
  • Oxygen (O) = 31.81%
  • Empirical formula =?

<h3>How to determine the empirical formula </h3>

The empirical formula of the compound can be obtained as illustrated below:

Divide by their molar mass

Na = 15.24 / 22.99 = 0.663

Br = 52.95 / 79.90 = 0.663

O = 31.81 / 16 = 1.988

Divide by the smallest

Na = 0.663 / 0.663 = 1

Br = 0.663 / 0.663 = 1

O = 1.988 / 0.663 = 3

Thus, the empirical formula of the compound is NaBrO₃

Learn more about empirical formula:

brainly.com/question/24297883

8 0
2 years ago
How many meters are in a kilometer.
Anika [276]

Answer:

1,000 meters in 1 kilometer

Explanation:

4 0
2 years ago
What is the main source of energy in a clear water stream in an open area
solniwko [45]

Answer:

c.sunlight

Explanation:

4 0
3 years ago
Read 2 more answers
What are the three physical properties of gases
daser333 [38]
They are described through the use of four physical properties or macroscopic characteristics: pressure, volume, number of particles (chemists group them by moles) and temperature.
5 0
3 years ago
Read 2 more answers
Which is bigger 145 m or 145 km
Citrus2011 [14]
145 km i think is bigger
8 0
3 years ago
Read 2 more answers
Other questions:
  • Nomadic people received income from where
    13·2 answers
  • Is Potassium Acetate an acidic or basic salt?
    12·1 answer
  • The rock record indicates that photosynthesis began on Earth about 3.5 million years ago.
    11·2 answers
  • How to determine oxidation numbers
    6·1 answer
  • What are isotopes.....
    14·1 answer
  • How do cations of the same charge change in radius as you move down a column in the periodic table?
    14·1 answer
  • most planets have --- but none has a --- like earth does. A. a biosphere; hydrosphere., B. an atmosphere; cryosphere., C. an atm
    8·2 answers
  • The type of response when a plant moves away from the stimulus
    8·1 answer
  • Atomic weight and atomic number of an element is 35 and 17 respectively<br>​
    13·1 answer
  • To find the number of neutrons in a atom, you subtract the number of_____ from the mass number.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!