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Salsk061 [2.6K]
3 years ago
13

According to the Quantum Atomic Theory of an atom, in an orbital

Chemistry
1 answer:
amm18123 years ago
4 0

Answer:

1) B

2) D

3) D

Explanation:

Quantum atomic theory was introduced in order to explain the behavior of subatomic particles, which could not be explained using classical physics and dynamics. Many scientists contributed to this, one of them being Heisenberg, who introduced the principle of uncertainty, stating that we can not determine the exact location and direction of motion of electron, and that there are regions of an atom in which the electrons most likely reside. These regions are called the orbitals.

Each atom consists of several energy levels (shells), depending on the number of electrons it has. They are distributed in these levels around the nucleus. Further, these levels are from the nucleus, higher the energy level is. Each shell consists of subshells, which consist of several orbitals, Each orbital has two electrons. So:

-s subshell has 1 orbital, or 1 • 2 = 2 electrons

-p subshell has 3 orbitals, or 3 • 2 = 6 electrons

-d subshell has 5 orbitals, or 5 • 2 = 10 electrons

-f subshell has 7 orbitals, or 7 • 2 = 14 electrons

etc.

When writing abbreviated or condensed electronic configuration we look up to the previous noble gas. This is used to avoid confusion and errors when writing configuration for atoms with a lot of energy levels and orbitals. We use noble gases because they are stable, inert or unreactive because their energy levels are completely filled, so we can use them as a basis on which we add excess electrons from the given atom.

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Name the unit being abbreviated in each measurement (spelling counts). Only write the name of the unit, do not include the numbe
givi [52]

Answer:

Litre (L) , Centimetre (cm) , Kilogram (Kg), Seconds (s) and Kelvin (K)

Explanation:

The units are used for the following measurement;

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Explain with example, why there cannot be an oxidation reaction without a corresponding reduction reaction
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Because matter cannot be created or destroyed
8 0
3 years ago
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Please help
lisabon 2012 [21]

Answer:

There are 2 hydrogen atoms, one magnesium atom, and 5 atoms in total.

Explanation:

We are given a compound in formula form. To make things easier to understand, we can first convert this to the name of the compound.

  • When a compound contains one or more elements in parentheses, these are usually a <u>polyatomic ion</u>.
  • Polyatomic ions are ions made up of two or more elements with a positive or negative charge over the entire ion. Commons examples of these NH₄⁺ (ammonia) and HCO₃⁻ (bicarbonate).
  • You can combine metals with polyatomic ions to create commonly known compounds, such as baking soda. The chemical name for baking soda is sodium bicarbonate, so we can combine Na (sodium) with HCO₃⁻ (bicarbonate) and create sodium bicarbonate: NaHCO₃.

This compound is one magnesium atom bonded to two hydroxide ions.

  • Hydroxide is the compound between one hydrogen atom and one oxygen atom. The compound overall adopts a negative charge of 1.
  • If we have one hydrogen atom and one oxygen atom, the most electronegative atom is written first in chemical formulas. Therefore, the symbol for Oxygen (O) goes first.
  • Then, write in the hydrogen atom directly after the O symbol: OH.
  • Finally, since we have a negative charge on the ion, we need to play a negative sign as a superscript for the compound. Therefore, this becomes OH⁻.

Now, we need to determine the charge on the Magnesium atom which is determined from the amount of valence electrons the atom has.

  • On a periodic table, the symbol for Magnesium is Mg and this element has 2 valence electrons.
  • In order to fulfill the Octet Rule, the It is more likely to give up 2 electrons to a nonmetal than it is to gain 6, so we can safely assume that the charge is ²⁺.
  • We need to use the criss-cross technique to transfer the charges between the element and the ion, so the negative 1 charge goes to the Mg, which does not appear (negative 1 or positive 1 are implied) and since the magnesium has a charge of positive 2, this is the subscript for the hydroxide ion.
  • Therefore, our compound becomes Mg(OH)₂, and we have labeled this as magnesium hydroxide.

Now, to the number of atoms:

  • The new charge on Mg is 1-, so there is only one atom of Mg.
  • The charge is 2+ on the OH ion, so there are two atoms of H and two atoms of O.
  • Two atoms of oxygen, two atoms of hydrogen, and one atom of magnesium add up to be five atoms in total.
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3 years ago
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sdas [7]

Answer : Option D) The particles move enough that they are not fixed in place, and the liquid can flow.

Explanation : The kinetic energy of the particles are allowed to move freely and are in motion when in the liquid state whereas the intermolecular particles can just flow; as the intermolecular attractions between the particles allows the liquid to flow by giving them a force to flow.

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