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lorasvet [3.4K]
2 years ago
9

An ion has 56 protons, 54 electrons, and 81 neutrons. What is its atomic number ?

Chemistry
2 answers:
-BARSIC- [3]2 years ago
8 0

The Atomic Number indicates the number of protons = 56

EastWind [94]2 years ago
5 0

Answer: The barium – 137 atom would have 56 protons, 56 electrons and 81 neutrons. The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.

Explanation: Hope this is helpful

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Which element has the lowest first ionization energy? (F), (Li), (Fr), (Rb)?
Mariulka [41]

Answer:

Fr

Explanation:

Francium (Fr) has the lowest ionization energy, with a value of 4.0727eV. This ionization energy increases as one advances in a period, being greater in the group of nonmetals.

6 0
3 years ago
What is the wavelength, in nm, of the light photon emitted by a hydrogen atom when an electron goes from n
xxMikexx [17]

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Hence, the wavelength of the photon associated is 1282 nm.

Explanation:

8 0
3 years ago
Cis-3-tert-Butylcyclohexanol has the tert-butyl group in the equatorial position and the alcohol in the ________ position.
Anni [7]

Answer:

Axial

Explanation:

In the most stable conformation of Cis-3-tert-Butylcyclohexanol, the tert-butyl group is at equatorial position and the alcohol group is in the axial position.

If the tert-butyl group is placed in equatorial position, repulsions are minimized. The bulkier the group, the greater the energy difference between the axial and equatorial conformers. Hence for a ring having a bulky substituent, such bulky substituent is better placed in the equatorial position.

The energy difference between the conformers of Cis-3-tert-Butylcyclohexanol is so high that the compound is almost "frozen" in a conformation  where the tert-butyl groups are equatorial and the -OH groups are axial. This conformer is more stable by 24 KJ/mol.

8 0
3 years ago
What Group is Zn (zinc) in?<br> O A. 4<br> O B. 2A<br> O C. 12<br> O D. 30
Oxana [17]
I believe it’s (C.12)
3 0
3 years ago
What mass of oxygen contains the same number of molecules as 42g of nitrogen?
lakkis [162]

Answer:

Given: 42 g of N2

Solve for O2 mass that contains the same number of molecules to 42 g of N2.

Solve for the number of moles in 42 g of N2

1 mole of N2 = (14 * 2) g = 28 g so the number of moles in 42 g of N2 is equal to 42 g / 28 g per mole = 1.5 moles

Solve for mass of 1 mole of oxygen

1 mole of O2 = 16 g * 2 = 32 g per mole

Solve for the mass of 1.5 moles of oxygen

mass of 1.5 moles of O2 = 32 g per mole * 1.5 moles

mass of 1.5 moles of O2 = 48 g

So 48 g of O2 contains the same number of molecules as 42 g of N2

3 0
3 years ago
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