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
Citrus2011 [14]
3 years ago
5

Write the atomic symbol for the isotope of bismuth with 125 neutrons.

Chemistry
1 answer:
vlada-n [284]3 years ago
5 0

First, isotopes <u>are the atoms of a single element whose nuclei have a different number of neutrons</u>, and therefore, differ in mass numbers. You should know that atoms are formed by a nucleus that has a small size and is made up of protons and neutrons. The nucleus is surrounded by a cloud of electrons, which are found in a region of the atom called the cortex.

The mass number, represented as A, <u>is the sum of the number of protons and neutrons in the nucleus</u>. On the other hand, the atomic number (Z) is <u>the number of protons that exist in the nucleus. </u>

The isotopes of an element X are represented as follows,

<em>(see first attached picture)</em>

It should be noted that the number of neutrons of a chemical element can be calculated as the difference A-Z.

<u>The atomic and mass numbers of bismuth with 125 neutrons are</u>:

Z = 83

A = 83 + 125 = 208

Thus, the atomic symbol of the bismuth isotope with 125 neutrons is:

<em>(see second attached picture)</em>

You might be interested in
A piece of potassium metal is added to water in a beaker. The reaction that takes place is 2K(s) 2H20(/) ..... 2KOH(aq) H2(g) Pr
kakasveta [241]

Answer:

Explanation:

The given reaction is exothermic . So ΔH is negative .

Gas is evolving so work done by gas is positive or w is positive.

Change in internal energy that is ΔU is negative.

q = u - w

u is negative , w is positive so q is negative .

4 0
3 years ago
½H2(g) + ½I2(g) → HI(g), ΔH = +6.2 kcal/mole 21.0 kcal/mole + C(s) + 2S(s) → CS2(l) What type of reaction is represented by the
wlad13 [49]

<u>Answer:</u>

Exothermic Reaction are those reaction, in which energy is released while in endothermic reaction are those, in which energy is absorbed.

<u>Explanation:</u>

First Reaction:

As in this reaction, energy is released

½H2(g) + ½I2(g) → HI(g), ΔH = +6.2 kcal/mole

so it is <em>exothermic reaction</em>

Second reaction:

As in this reaction, energy is absorbed

21.0 kcal/mole + C(s) + 2S(s) → CS2(l)

so it is <em>endothermic reactions</em>.


7 0
3 years ago
Read 2 more answers
Please answer this Q:
Anarel [89]
D. container four because of the water
3 0
2 years ago
Choose the value for rotation to place triangle ABC on top of triangle DEF. How can you complete the transformation in only one
MariettaO [177]

Answer:90°

Explanation:

7 0
2 years ago
Read 2 more answers
Describe the difference between a reaction that occurs spontaneously and one that does not
lidiya [134]
2.B. Describe the difference between a reaction that occurs spontaneously and one that does not. Spontaneous chemical reactions release energy and use that energy to power itself; non-spontaneous chemical reactions need to absorb energy, which they can't absorb their own energy that they don't even have.
4 0
3 years ago
Other questions:
  • How many is an octet of electron
    7·2 answers
  • a rough guide to fluid requirements based on body weight is 100mL/kg for the first 10kg of body weight, 50mL/kg for the next 10k
    9·1 answer
  • What is the net ionic equation of the reaction of MgSO4 with Pb(NO3)2? Express you answer as a chemical equation including phase
    6·1 answer
  • Which of the following pure liquids is the best solvent for sodium fluoride?a. CCl4b. C2C6c. HCld. BCl3e. PCl5
    12·1 answer
  • What is an example of a base? carbonic acid sodium carbonate sodium hydroxide hydrochloric acid
    7·1 answer
  • Do you think climate change is a hoax or is it a scientifically valid disrupter of<br> ecosystems?
    6·2 answers
  • The normal boiling point of a certain liquid X is 130.9 °C, but when 19.9 g of urea (NH2) CO are dissolved in 200. g of X, it is
    15·1 answer
  • Using the average atomic masses given inside the front cover of this book, calculate the number of atoms present in each of the
    5·1 answer
  • Which grouping of circles, when considered in order from the top to the bottom, best represents the relative size of the atoms o
    6·1 answer
  • Which of the following is compound?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!