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
Nezavi [6.7K]
3 years ago
9

Based on the periodic table, what do we now call the element mendeleev called eka-manganese?

Chemistry
2 answers:
myrzilka [38]3 years ago
8 0
Based on the periodic table, the element mendeleev called eka-manganese is now called technetium. Technetium<span> is a silvery-gray metal that tarnishes slowly in moist air. Hope this answers the question. Have a nice day. Feel free to ask more questions.</span>
Keith_Richards [23]3 years ago
6 0

Answer:

Technetium

Explanation:

The Mendeleev element called eka-manganese is now called Technetium.

Technetium is a crystalline, silver and radioactive metal, very similar to platinum. It serves as a gamma ray source of beta particles. Most of the technetium produced on Earth is a byproduct of uranium-235 fission in nuclear reactors and is extracted from nuclear fuel rods. No isotope of technetium has a half-life of more than 4.2 million years, so its detection in 1952 helped reinforce the theory that stars can produce heavier elements.

You might be interested in
What is the difference between a sodium atom (Na) and a sodium ion (Na1+) ?
lora16 [44]
One deals with electrons while the other protons.
6 0
3 years ago
Hydrogen has a volume of 1.0l and the pressure is 5.4 ATM if the initial temperature is 33 degrees c the final volume is 2.0 l a
Andre45 [30]

Answer:

487.33 K.

Explanation:

  • To calculate the no. of moles of a gas, we can use the general law of ideal gas: <em>PV = nRT.</em>

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant.

T is the temperature of the gas in K.

  • If n is constant, and have two different values of (P, V and T):

<em>P₁V₁T₂ = P₂V₂T₁</em>

<em></em>

P₁ = 5.4 atm, V₁ = 1.0 L, T₁ = 33°C + 273 = 306 K.

P₂ = 4.3 atm, V₂ = 2.0 L, T₂ =??? K.

<em>∴ T₂ = P₂V₂T₁/P₁V₁</em> = (4.3 atm)(2.0 L)(306 K)/(5.4 atm)(1.0 L) = <em>487.33 K.</em>

5 0
3 years ago
Help meeeeeeeeeeeee its impossibleeeeee
fredd [130]

Answer:

Nice! If only....

Explanation:

6 0
2 years ago
Read 2 more answers
Where is desertification likely to occur?
viktelen [127]
I think in drylands, drylands are particularly affected by desertification.
5 0
3 years ago
Read 2 more answers
What does the frequency of a wave represent? A. the distance between two consecutive crests B. the number of wave cycles that pa
zepelin [54]

The frequency of a wave represents B. the number of wave cycles that pass through a specific point within a given time.

The distance between two consecutive crests and the length of a wave are the <em>wavelength</em>.

The distance between the highest and lowest points of a wave is <em>twice the amplitude</em>.

6 0
3 years ago
Other questions:
  • Which of the following has the greatest heat capacity? a) 1000g of steel b) 1 g of steel c) 1 g of water d) 1000 g of steel
    10·2 answers
  • Manganese metal can be prepared by the thermite process: 4Al(s) . 3MnO2(s). --&gt;. 3Mn(l). 2Al2O3(s) molar masses, in g/mol: 26
    7·1 answer
  • Explain why critical thinking is particularly important when evaluating promotional materials​
    14·1 answer
  • How many atoms are in 1.50 moles of fluorine gas?
    15·2 answers
  • What happens on the side of the earth opposite the moon
    11·2 answers
  • What is the pH of a solution with a hydrogen concentration of [H+] = 1 x 10-4 M?
    15·1 answer
  • Who was the first governor of the Massachusetts Bay Colony?
    13·1 answer
  • Liquids are similar to gases in that they both have
    9·1 answer
  • How can the conductivity of a salt solution be decreased?
    5·1 answer
  • How do we determine the volume of an irreguler shaped object?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!