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
Leviafan [203]
3 years ago
14

Give the number of protons, neutrons and electrons in 99Tc

Chemistry
1 answer:
miss Akunina [59]3 years ago
5 0

Explanation:

Tc - 99 is technetium 99.

It is a radioactive element that decays spontaneously. It has a half-life of 211,000 years and decays to stable ruthenium.

  • On the periodic table, it has an atomic number of 43;

Mass number  = 99

Atomic number = number of protons = number of electrons in atom

  Number of protons in Tc is 43

                      electron is 43

Mass number = number of protons + number of neutrons

  Number of neutrons = mass number - number of protons = 99-43 = 56

learn more:

Atomic number brainly.com/question/2057656

#learnwithBrainly

You might be interested in
Iron-60 Express your answer as an isotope.
lys-0071 [83]

Isotopes are variants atoms of the same element, having same number of atomic(proton) number but different number of neutrons and mass number.

Considering iron-60

  • The atomic number which also equals the number of protons for the element iron as can be seen on the periodic table is 26
  • The name  iron-60 also tells us that this particlar  isotope's mass number is 60.  
  • The chemical symbol for Iron  is Fe

Now expressing  as an isotope iron-60 becomes   ⁶⁰₂₆Fe ( very unstable )

Other stable isotopes of Iron include   ⁵⁴₂₆Fe , ⁵⁶₂₆Fe, ⁵⁷₂₆Fe and ⁵⁸₂₆Fe

See more here: brainly.com/question/11236150

4 0
3 years ago
Most elements are _____? <br><br> nonmetals <br> metalloids<br> metals
NARA [144]

Answer:Most elements on the periodic table are metals. Looking at the periodic table shows that most elements are metallic.

Explanation: Sorry if this want what you were looking for

4 0
1 year ago
the mechanical advantage of a wheel and axle is the radius of the wheel divided by radius of the wheel divided by the radius of
denis-greek [22]
B 6 ft 2 in. = _____ ft
7 0
2 years ago
Read 2 more answers
Please Help , Thank You
ivanzaharov [21]
I think it enters a new  material
8 0
3 years ago
The following molecular equation represents the reaction that occurs when aqueous solutions of silver(I) nitrate and calcium chl
dsp73

Answer:

Ag+(aq) + Cl-(aq) —> AgCl(s)

Explanation:

2AgNO3(aq) + CaCl2(aq) —>2AgCl(s) + Ca(NO3)2(aq)

The balanced net ionic equation for the reaction above can be obtained as follow:

AgNO3(aq) and CaCl2(aq) will dissociate in solution as follow:

AgNO3(aq) —> Ag+(aq) + NO3-(aq)

CaCl2(aq) —> Ca2+(aq) + 2Cl-(aq)

AgNO3(aq) + CaCl2(aq) –>

2Ag+(aq) + 2NO3-(aq) + Ca2+(aq) + 2Cl-(aq) —> 2AgCl(s) + Ca2+(aq) + 2NO3-(aq)

Cancel out the spectator ions i.e Ca2+(aq) and 2NO3- to obtain the net ionic equation.

2Ag+(aq) + 2Cl-(aq) —> 2AgCl(s)

Divide through by 2

Ag+(aq) + Cl-(aq) —> AgCl(s)

The, the net ionic equation is

Ag+(aq) + Cl-(aq) —> AgCl(s)

4 0
3 years ago
Other questions:
  • How to tell if a reaction is exothermic or endothermic from an equation?
    15·1 answer
  • How does the ph of an acid compared to the ph of a base?
    14·1 answer
  • What is the building block of matter :(?
    14·1 answer
  • Ammonia gas can be prepared by the following reaction:CaO(s) + 2NH4Cl(s) ------&gt; 2NH3(g) + H2O(g) + CaCl2(s)In an experiment,
    5·1 answer
  • In which type of climate does chemical weathering occur fastest
    5·1 answer
  • 1) h2+o2 -&gt; h2o<br><br> does equation 1 follow the law of conservation of mass? how can you tell?
    10·1 answer
  • 5. Which happens last in the process of photosynthesis?
    8·1 answer
  • Determine the relative formula mass of dihydrogen monoxide using the periodic table below.
    11·1 answer
  • Explain why nitrogen diffuses faster than clorine
    8·2 answers
  • Ethanol is highly toxic if it is consumed in large quantities. Although it is the second least toxic of the five alcohols discus
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!