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umka2103 [35]
4 years ago
7

The elements that contain electrons in an F sublevel near the highest occupied energy level are referred to as?

Chemistry
2 answers:
ser-zykov [4K]4 years ago
8 0

inner transition metals is your answer

Mrac [35]4 years ago
3 0

inner transmission levels i took the test

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Determine the number of protons and neutrons in plutonium-239 and enter its symbol in the form azx.
Komok [63]
Answer:

number of protons: 94
number of neutrons: 145

  239
       Pu
   94

Explanation:

1) The atomic number, Z, of plutonium is Z = 94, i.e plutonium 94 protons

2) Plutoniun-239 is the isotope with mass number 239.

3) Mass number = number of protons + number of neutrons =>

number of neutrons = mass number - number of protons = 239 - 94 = 145

4) The notation requires that you indicate the symbol of the element with the atomic number (number of protons) and the mass number.

You put the mass number as a superscript at the left side of the symbol and the atomic number as subscript to the left of the symbol.

So, in this case the symbol is Pu, the superscript to the left is 239 and the subscript to the left is 94.

  239
       Pu
   94


7 0
3 years ago
When you find a new source of information, why is it important to think for yourself about whether to use that source?
dybincka [34]

Answer:

to make sure that the source is reliable.

Explanation:

because I am smart

7 0
3 years ago
2 Points<br> Which of the following is described by the equation H2O(l) + heat → H2O(g)?
White raven [17]
Which of the following is described by the equation H2O(l) + heat → H2O(g)?


Answer: +H30
7 0
4 years ago
Entalpy of vaporization of water is 41.1k/mol. if the vapor pressure of water at 373k is 101.3 kpa, what is the vapor pressure o
allsm [11]

Answer: The vapor pressure of water at 298 K is 3.565kPa.

Explanation:

The vapor pressure is determined by Clausius Clapeyron equation:

ln(\frac{P_2}{P_1})=\frac{\Delta H_{vap}}{R}(\frac{1}{T_1}-\frac{1}{T_2})

where,

P_1 = initial pressure at 298 K = ?

P_2 = final pressure at 373 K = 101.3 kPa

\Delta H_{vap} = enthalpy of vaporisation = 41.1 kJ/mol = 41100 J/mol

R = gas constant = 8.314 J/mole.K

T_1 = initial temperature = 298 K

T_2 = final temperature = 373 K

Now put all the given values in this formula, we get

\log (\frac{101.3}{P_1})=\frac{41100}{2.303\times 8.314J/mole.K}[\frac{1}{298K}-\frac{1}{373K}]

\frac{101.3}{P_1}=antilog(1.448)

P_1=3.565kPa

Therefore, the vapor pressure of water at 298 K is 3.565kPa.

3 0
4 years ago
A belief judgement or way of thinking about something is called?
Olenka [21]

opinion and belief mean a judgment that someone thinks is true. ... belief is used if the judgment is certain and firm in a person's own mind without regard to the amount or kind of evidence.

4 0
3 years ago
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