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4 years ago

Please help me. Can you explain energy principle level?

1 answer:

8 0

Rules for the Principal Energy Level. A principal energy level may contain up to 2n2 electrons, with n being the number of each level. The set of three p orbitals can hold up to 6 electrons. Thus, the second principal energy level can hold up to 8 electrons, 2 in the s orbital and 6 in the p orbital.

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Provide an orbital energy level diagram for the geound state of a nitrogen atom.

Alenkasestr [34]

Answer:

Explanation:

Nitrogen is an atom made up of 7 electrons.

To draw the orbital energy level diagram, let us write the orbital notation of the atom;

7 electrons of Nitrogen:

1s² 2s² 2p³

So,

The orbital notation diagram is :

1s² 2s² 2p³

↑↓ ↑↓ ↑↑↑

6 0

3 years ago

When lithium nitride, Li3N(s) , is treated with water, H2O(l) , ammonia, NH3(g) , is produced. Predict the formula of the gas pr

Ronch [10]

Answer: The gas produced when sodium phosphide reacts with water is phosphine.

Explanation:

When sodium phosphide reacts with water molecule, it leads to the production of flammable, poisonous gas known as phosphine along with the production of sodium hydroxide.

The chemical reaction for the reaction of sodium phosphide with water follows the equation:

$Na_3P(aq.)+3H_2O(l)\rightarrow PH_3(g)+3NaOH(aq.)$

By Stoichiometry of the reaction:

1 mole of sodium phosphide reacts with 3 moles of water to produce 1 mole of phosphine gas and 3 moles of sodium hydroxide.

Hence, the gas produced when sodium phosphide reacts with water is phosphine.

7 0

3 years ago

Using the periodic table, complete the table to describe each atom. Type in your answers

Anit [1.1K]

Answer:

A: 4

B: 6

C: Be

D: 10

E: 22

F: Ne

Explanation:

The periodic table shows the elements ordered by atomic number in an arragement of 18 columns and 7 rows.

The atomic number is the number of protons of the elment and this identifies each element unequivocally.

Thus, once you know the atomic number you just need to locate the element in the periodic table and read the symbol and other data.

Other important definition that you need to know is:

Mass number = number of protons + number of neutrons

You also should know that the row represents the period of the element (which is the main energy level in the quantum model of the atom), and the column represents the group (e.g. grouo 1 = alkali metals, group 18 = noble gases).

1) A: atomic number

The first cell of the first row of the given table indicates that the number of protons is 4.

Then, per definition atomic number = number of protons = 4.

2) B: mass number

The mass number, A, of an element is equal to the number of protons (Z) plus the number of neutrons (N).

Z = A + N

From the table: A = 4 and N = 2. Thus:

Mass number = Z = 4 + 2 = 6

3) C: element (symbol)

Once, you know the number of protons (atomic number), you just need to locate the element in the table.

You will find that the element with the atomic number 4, is in the period (row) 2 and group (column) 2.

Its chemical symbol is Be and its name is berillyum.

4) D: number of protons

This is the next row of your table.

In the fourth cell of this secon row you can read that the atomic number is 10.

Then, as indicated above, per definition, the atomic number is the number of protons.

Thus, the number of protons is 10.

5) E: mass number

As said previously, the mass number is equal to the number of protons (Z) plus the number of neutrons.

You have:

Number of protons = atomic number = 10

Number of neutrons: 12

Mass number = 10 + 12 = 22

6) F: element (symbol).

In the periodic table, you locate the element with atomic number 10 in the column 18 (group of the noble gases) and the period (row) 2.

The element is neon and its chemical symbol is Ne.

3 0

3 years ago

For the first ionization energy for an N2 molecule, what molecular orbital is the electron removed from

olga55 [171]

Answer:

p orbital.

Explanation:

Valence electrons are the electrons in an atom holding the very last orbital which is used in chemical bonding with other elements. Their existence could define the chemical properties of that atom.

During the first energy in ionization of an N2 molecule the molecular orbital from which the electron could be extracted is the only one with the highest energy level. Nitrogen has its outermost orbital (p) containing three valence electrons. Each orbital is only half filled, and thus it is unstable Thus, the electron mission must have been removed from p orbital.

7 0

3 years ago

A silver rod and a SHE are dipped into a saturated aqueous solution of silver oxalate, Ag2C2O4, at 25°C. The measured potential

nika2105 [10]

Answer:

3.50*10^-11 mol3 dm-9

Explanation:

A silver rod and a SHE are dipped into a saturated aqueous solution of silver oxalate, Ag2C2O4, at 25°C. The measured potential difference between the rod and the SHE is 0.5812 V, the rod being positive. Calculate the solubility product constant for silver oxalate.

Ag2C2O4 --> 2Ag+ + C2O4 2-

So Ksp = [Ag+]^2 * [C2O42-]

In 1 L, 2.06*10^-4 mol of silver oxalate dissolve, giving, the same number of mol of oxalate ions, and twice the number of mol (4.12*10^-4) of silver ions.

So Ksp = (4.12*10^-4)^2 * (2.06*10^-4)

= 3.50*10^-11 mol3 dm-9

7 0

3 years ago