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svlad2 [7]
3 years ago
14

How do you write electron configurations in 2 steps?​

Chemistry
1 answer:
Galina-37 [17]3 years ago
7 0

Explanation:

Electron configuration can be carried out in two steps which can be:

  • Sublevel notation
  • Shell notations.

In the sublevel notation, the sequence of filling electrons into the orbitals of the sublevels are guided by some principles:

  • the maximum number of electrons in the orbital of sublevels are two for s-sublevel, six for p-sublevel, ten for d-sublevel and fourteen for f-sublevel. This indicates that the maximum number of electrons in an orbital is two.
  • Aufbau's prinicple states that sublevel with lower energies are filled up before those with higher energies.
  • Pauli exclusion principle states that no two electrons in an atom can have the same set of the four quantum numbers.
  • Hund's rule states that electrons go into degenerate orbitals singly first before pairing occurs.

Using the shell notation, numbers are used to denote the sum of electrons in all orbitals each energy level.

   For an atom of Be:

               Sublevel notation for the 4 electrons     1s²2s²

                        Shell notation                                    2,2

Other representation is using the electron dot structure.

Learn more

electronic configuration brainly.com/question/9616334

#learnwithBrainly

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A solution is formed by mixing 15.2 g KOH into
nikitadnepr [17]

Answer:

There are approximately 0.271\; \rm mol of formula units in that \rm 15.2\; g of \rm KOH (the solute of this solution.)

Explanation:

A solution includes two substances: the solute and the solvent. Note the solution here contains significantly more water than \rm KOH. Hence, assume that water is the solvent (as it is in many other solutions.)

The (molar) formula mass of \rm KOH is necessary for finding the number of moles of

  • One \rm K atom,
  • One \rm O atom, and
  • One \rm  H atom.

The formula mass of \rm KOH will thus be the sum of:

  • The mass of one mole of \rm K atoms,
  • The mass of one mole of \rm O atoms, and
  • The mass of one mole of \rm H atoms.

On the other hand, the mass (in grams) of one mole of atoms of an element is (numerically) the same as its relative atomic mass. The relative atomic mass data can be found on most modern periodic tables.

Relative atomic mass data from a modern periodic table:

  • \rm K: 39.098.
  • \rm O: 15.999.
  • \rm H: 1.008.

For example, the relative atomic mass of \rm K (potassium, atomic number 19) is 39.098 (3 sig. fig.) Hence, the mass of one mole of

The formula mass of \rm KOH is the sum of these three masses:

\begin{aligned}& M(\mathrm{KOH}) \\ &\approx 39.098 + 15.999 + 1.008 \\ &= 56.105\; \rm g \cdot mol^{-1}\end{aligned}.

The number of moles of \rm KOH formula units in this 15.2\; \rm g sample would be:

\begin{aligned}n &= \frac{m(\mathrm{KOH})}{M(\mathrm{KOH})} \\ &\approx \frac{15.2\; \rm g}{56.105\; \rm g \cdot mol^{-1}} \approx 0.271\; \rm mol \end{aligned}.

6 0
3 years ago
HELPPPPP!!
Lelechka [254]

Answer:

D. 45.0 g

Explanation:

In present reaction, 1 mol of N2 react with 3 moles of H2 to generate 2 moles of NH3

Thus, 2 moles of NH3 ≡ 3 moles  of H2

Therefore, 15 moles of NH3 ≡ (3×15)/2 = 22.5 moles of H2.

We know that, 1 mole of H2 ≡ 2 g

Therefore, 22.5 moles of H2 ≡ 2 × 22.5 = 45 g

Thus, 45 g of hydrogen are needed to produce 15.0 mol of ammonia, if the reaction goes to completion

3 0
3 years ago
A can of hairspray is crushed down to half its normal volume. What will
erik [133]

Answer:

pressure doubles

Explanation:

they are inversly preportional

6 0
2 years ago
The source of alpha particles in a smoke detector is the
pantera1 [17]

The source of alpha particles in a smoke detector is the Americium.

5 0
2 years ago
In the following pair, determine whether the two represent resonance contributors of a single species or depict different substa
Aleksandr-060686 [28]

Answer:

They are resonance contributors

Explanation:

Resonance structures are structures that differ only in the distribution or placement of electrons.

Considering the two structures, we can easily see that the two species have the same total number of bonds and electrons differing only in the distribution of these electrons.

Hence, they are resonance contributors.

5 0
3 years ago
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