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3 years ago

What element has 4 valence electrons and 5 electron shells?

Chemistry

1 answer:

marta [7]3 years ago

8 0

Answer: Tin (Sn)

Explanation: The electron configuration for tin (Sn) is shown in the picture. It's last electrons are:

5s^2 4d^10 5p^2

The valence electrons are in the 5th electron shell and include 2 each in the 5s and 5p orbitals.

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Ozone _____.

elena55 [62]

Absorbs harmful radiation from the sun

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3 years ago

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4. Explain why 50 g of liquid water at 0°C heats-up more quickly than 50 g of an ice water mixture at 0°C under the same conditi

Minchanka [31]

4) the ice has to be heated up to above 0c first, as it is continuing to cool the water back toward 0c
5) 0.0338 kcal
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3 years ago

Calculate the standard entropy of vaporization of ethanol at its boiling point 285 K. The standard molar enthalpy of vaporizatio

Ivanshal [37]

Answer:

standard entropy of vaporization of ethanol = 142.105 J/K-mol

Explanation:

given data

enthalpy of vaporization of ethanol = 40.5 kJ/mol = 40.5 × $10^{3}$ J/mol

entropy of vaporization of ethanol boiling point = 285 K

to find out

standard entropy of vaporization of ethanol

solution

we get here standard entropy of vaporization of ethanol that is expess as

standard entropy of vaporization of ethanol ΔS = $\frac{\Delta H}{T}$ .............1

here ΔH is enthalpy of vaporization of ethanol and T is temperature

put value in equation 1

standard entropy of vaporization of ethanol ΔS = $\frac{40.5*10^3}{285}$

standard entropy of vaporization of ethanol = 142.105 J/K-mol

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3 years ago

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C-12 has 6 protons. how many neutrons does c-13 have? select one:

lina2011 [118]

I think it's Letter c.13 if I'm not mistaken

3 0

3 years ago

The mass number for an atom is numerically equal to which quantity

Misha Larkins [42]

Answer:

The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in an atom is its mass number minus its atomic number.

Explanation:

protons

The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.

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3 years ago